Siaon Optoelectronic Biometric Recognition 1.8mm 5MP SA-01824HB Low Distortion M12 Lens

Siaon Biometric Recognition 1/2.7" 1.8mm 5MP Fno.2.4  SA-01824HB M12 mount lens


Model:SA-01824HB
Focal Length(mm):1.8
F NO.:2.4
M.O.D.(m):0.1
Iris:Fixed
Angle of View(HxV):110°x95°
Format:1/2.7"
Mount:M12x0.5
Resolution:5MP
Application: Face Recognition, Biometric Access control system, High-Speed Scanner, Vision Inspection 


www.siaon.com

Ovonic LiPo Battery Deal, Up to 50% off

for the important Memorial Day, Ampow gives the best Memorial day sales 2019 and provides an Extreme Deal for RC hobby batteries. Good news for us Hobbyists! This activity will last 10 days from 27th May to 5th June.


Buy 3 Get 1 Free: FPV Batteries
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If you buy 3 packs of FPV batteries, you will get a free one. FPV batteries cover Ovonic 1300mah to 1550mah, from 3S to 6S.


Up to 50% off for RC Airplane Batteries

In addition, there is a great discount for and airplane batteries. Especially for RC airplane batteries, You’ll save a whopping 50%. great deals on battery for small foam plane, park flyer, glider, X-class drone, and 64mm-80mm EDF jet and more. So What are you still waiting for?


Great deal on RC Car Batteries

Last but not least, for RC car, here are most popular 2s lipo batteries such as Ovonic 5000mah/5200mah 2s for your 1/10 and some of 1/8 rc car trucks, such as short course, monster truck, buggy etc.


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As to 3s, there also have great deals like 4500mah 3s,5200mah 3s,5500mah 3s. 4500mah 3s with 135mm*40mm*25mm(L*W*H) battery dimension for most of 1/10 monster truck, crawler etc.


5500mah 3s with a larger capacity and longer size(155mm of length), great for some model with larger battery tray, such as 1/10 slash, E-Revo, 1/8 axial yeti, etc. 5200mah 3s with EC3 can be fit for most of losi 1/10 truck.


Check deals now: https://www.ampow.com/memorial-day-sale

How Much You Really Know About Ovonic

Ovonic, founded in 2017, aims to build a direct to customer online battery brand and to create an easier solution for newcomers to break into the RC world. Ovonic prides itself with the best prices and multi-choice of batteries to power up all forms of RC’s from land to air.



Company Mission



Our mission is to bring real fun to this community without the high price tag. With our high discharge, high quality, and great prices, our batteries will allow every hobbyist to enjoy the incredible power, speed, and pleasure while playing with their friends or even training alone.



Committed to Solving Issues



Not only are we committed to the high quality of our batteries but we also prioritize our RC related issues by keeping knit bonds with RC hobbyists. We take serious consideration of the ever-changing needs of our customers and constantly strive to improve our batteries for our community.



Team Ovonic



We love RC and everyone and anyone who loves RC. We built an amazing team – Team Ovonic. Who are our members? David Graves, Jeff Bates, Luiz Rena Meireles – fpv, Mako Reactra, and Justin Kent Furnis! They love the RC community and are constantly challenge themselves to keep improving and to push the boundaries of FPV further. We will announce more pilots and drivers in the coming days. Now, let’s tackle different types of challenges ahead of us together, so that we may grow and improves a team!


Mako Reactra from team ovonicRenato


Overview



As an emerging battery brand, Ovonic has been lucky enough to be recognized by RC hobbyists that we are a trustworthy and high-quality brand. All we ask is people to give our batteries a try, and most people are impressed with the high performance and the amazing price point.


The Source from: https://www.ampow.com/about-us

In for Review: Flyzone Extra 300SX Brushless Rx-R

We have been watching and waiting since Flyzone announced their first true aerobatic model, an Extra 300, a while back. We were excited to see this new model show up at the FlyRC offices today and wasted no time in getting the kit components out for a few photos. This model comes out of the box as a Receiver Ready model; simply add a minimum four channel radio system and 3S 11.1 volt 1800-2200mAh LiPo. As an extremely low parts count kit, assembly is guaranteed to take way less than an hour. The Flyzone Extra 300 comes equipped with a 35mm 1000Kv brushless outrunner, a 30 amp ESC and four sub-micro servos already installed. We like the magnetically retained and removable cowl, wheel fairings and canopy hatch. Manufactured using durable Aerocell foam, the Extra comes slathered in a squeaky clean looking gray, red and black color scheme. We hope to have this model ready to go and in the air for photos and video lickety split. In the meantime, enjoy these studio photos and the Flyzone factory video showing this Extra doing its thing!


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Specifications:


• Wingspan: 41.5 in (1055 mm)


• Wing Area: 297 in² (19.2 dm²)


• Weight: 28-31 oz (795-880 g)


• Wing Loading: 13.6-15.0 oz/ft² (42-46 g/dm²)


• Length: 34.5 in (875 mm)


• Requirements: 4+ channel radio and receiver, 3S 2200mAh 30C LiPo battery, balancing LiPo charger


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Traxxas X-Maxx Review

Traxxas X-Maxx at a glance


The X-Maxx is widely considered the top-of-the-line model from US giants Traxxas. Its tough chassis and powerful 4WD transmission make for some incredible performance.


  • Max' huge sizing: 78cm long, 54cm wide and 35cm tall!
  • 8.6kg excluding batteries
  • 14.5cm diameter by 11cm wide wheelset
  • 50+ MPH with Two 4s LiPo Batteries and Included Optional Spur Gear
  • Powerful VXL-8s ESC (inc stability control) and Velineon 1200XL
  • Tough Modular Composite Chassis
  • Shaft driven 4-wheel drive with all metal gears
The X-Maxx in Action

So straight to what you want to see, the X-Maxx in full flight. Rocking two 4S 6700mAh batteries the performance out of the box is simply unrivalled. Few in the office had ever driven an RC car with this much power and the TSM system is a welcome help for beginners! Any sort of loose surface allows for wide controlled powerslides, fast turns allowing the truck to lift its inner wheel as the weight shifts to the outside of the corner.


Just keeping up with the camera was a job in itself with the truck happy to hammer along at 40+mph!


Practising on soft surfaces, we tuned our driving style, getting used to the weight and inertial ‘moment’ when the vehicle was airborne. When off the ground the vehicle felt almost like it could defy gravity, with huge hang-time before it pounded back to the dirt.


What is better than a Traxxas X-Maxx?

We got in contact with friend of RC Geeks and fellow X-Maxx owner Dan, to join us for a tear up in the park because the only thing better than a Traxxas X-Maxx is two X-maxx!


Dan’s X-Maxx features a different gearing ratio, a revised speed controller, shock covers and a few other tweaks. He also ran a pair of hobbyking batteries with a higher burst rating, taking advantage of that speed controller.


With two competitive drivers at the controls it was interesting to see the differences the modifications made.


Dan’s red liveried Xmaxx had a clear top speed advantage and its ‘punch’ would balloon out the tyres under heavy acceleration loads.


As a result our X-Maxx (which we previously couldn’t have imagined with any more power) was left behind on long drag races!


It was great to hear from a user who had run the truck for several months, especially that the ownership experience (bar issues with shell mounting) had largely been trouble free.


X-Maxx self-righting system

Whilst the truck has great ground clearance, this also means its centre of gravity is quite high. With all that weight on board it can just be a matter of coming off the throttle a touch early over a jump, for the model to tumble over into a crash landing.


By holding down the set button on the transmitter (and nothing else) you can enable the ‘self-righting’ system on the model. This pulses the motor forward and backward, using the inertia generated through the model to flip the truck back onto its wheels.


When it does work, it is fantastic, rocking back and forth until it flips back onto its tyres as shown above. Sadly if the truck is on anything but a flat and stable surface we found the system struggled. Indeed the truck would often unbalance half way through the process, erratically bursting power through the drive-train resulting it frantically spinning its wheels whilst laying on its side. Thankfully you can cancel the self-righting procedure by hitting the brakes.


X-Maxx Huge jumps

This sort of tomfoolery is what the X-maxx was built for! From the skatepark to the pump track, the Xmaxx has the power and strength to fly high, land hard yet carry on regardless.


The massive dampers with their big springs enable to truck to shrug off landings that would kill lesser RC models.


The trick to maintaining the attitude of the truck in the air is in the throttle control. Leaving a touch of throttle will often keep the truck relatively level. Braking or aggressively lifting from the throttle will cause the truck to ‘nose down‘, useful if you have opted for a ‘full send’ off of a jump with a big kicker.


Power for power

Battery selection is important for the X-Maxx. Ensuring you have cells that can power that ESC will allow you to make the most of the model. As expensive as it is, at nearly 10kg with the cells in, you definitely don’t want to run out of juice miles from base!


We’d also suggest getting hold of the Traxxas link system which will allow you to monitor live, the battery status of the truck via a bluetooth link to your phone.


The X-Maxx is ‘wheelie’ good

The standard X-Maxx party piece has to be prolonged wheelies. The first time you get hard on that throttle your heart stops until you realise that it comes with a wheelie bar stopping the truck from flipping over!


To get the truck to perform a sustained wheelie, give it full power from a standing start to raise the front wheels off of the ground. Immediately feather the throttle back before holding the power, the truck will dip slightly before picking up the pace with its wheelie bar firmly pinned to the floor and its nose in the air.


X-Maxx Shell modification

We love how easy it is to stick the X-maxx’s shell on. Nose down and push forward to hook that front claw below the bonnet under the shock towers, then drop the rear down into place. Swing down the latch, rotate 90 degrees and its on! No faffing about with little metal body pins that you invariably lose when swapping out batteries in the field.


However considering the abuse the chassis can take, we are a bit disappointed at how thin the provided shell is! We’d go as far as saying that this is the literally the weakest point of the whole experience. Within a week we had ‘pulled through’ the shell where the body mounting system attaches with four hex bolts. This meant the body would actually lift up around these bolts and off of the shell mounting structure below under acceleration.


A simple preventative solution is to remove the hex bolts and fit small washers between the bolts and the top of the body.


For us it was too late as the bolt heads had crimped off a good 2mm of the shell all around the bolt hole.  Thankfully Dan, was able to 3D print us off a whole load of stepped conical washer-style parts (as seen above) that fit perfectly around the bolt thread and spread out over the shell holding it firm.


Can the X-maxx really ‘walk on water’?

Yes! There are numerous videos on youtube showing the truck hydroplaning across lakes but how is it achieved? All you need are the right tyres! We’d love to know who found out that you can hydroplane the truck, presumably someone who ran a little wide at the beach and didn’t lift? Nothing on the X-maxx is cheap, but paying £140 for sand and water capability seems like a pretty good deal.


What’s next for our Traxxas Xmaxx?

What trails or tests would you like to see us put our Xmaxx through? Beyond an upgraded speed controller, there is certainly little that the X-maxx needs. What modifications should we do? We look forward to fitting some sand paddles and taking to the water ourselves but would be interested in hearing what you would like to see. Leave us ideas in the comments section below.


Pickup a Traxxas X-maxx today!

We have Traxxas’ X-maxx (along with many of their awesome models) in stock and ready to ship. If you have a mainland UK address (and order on any weekday bar friday, before midday) we’ll even ship it to you via next-day courier absolutely free!


The X-maxx’s body is predominantly black but there are three colourways that offer different decals and coloured anodised damper bodies, wheel hubs, toe links, wheel nuts and more. They are available in red, green and blue as pictured in our article.


To get the most out of the car you are going to want to get a pair of Traxxas/compatible 4S batteries. For our article we used two of the 6700mAh 4 cell LiPo’s (that have a 50C burst) to give our truck the punch we wanted. If you don’t have a charger you might consider going for this combo pack that includes the live charger and two of those batteries.

Ovonic 5000 2s Lipo Battery Pack Review

Ovonic 5000mah 2s for RC Car Reviews

This is the new OVONIC 7.4V 5000mAh 50C 2S LiPo battery pack from Ampow. The battery features a hard case design with a 12-gauge pre-wired Deans (T-style) connector and JST-XH balance charge connector. It is rated with a 50C discharge and 100C max burst discharge rate. The battery is a standard “stick pack” with dimensions of 137mm x 45mm x 24mm and weighs in at 302 grams.


This OVONIC pack is ideal 1/10-scale off-road vehicles which use a full-length battery pack (such as short course trucks, monster trucks, and rock crawlers). 


This 2s lipo battery with 5000mah provided ample run-time in our Traxxas 2wd Slash with a modified motor, and remains well balanced and consistent charge after charge.


Specifications (provided by Ampow):


  • Brand: Ovonic 
  • Chemistry: Li-polymer
  • Cells Number: 2S
  • Voltage(V): 7.4V 
  • Capacity(mAh): 5000mAh 
  • Discharge: 50C 
  • Max Burst Discharge Rate ©: 100C 
  • Charge Plug: JST-XH
  • Discharge Plug: Deans Plug
  • Battery Weight(dev.20g): 302g 
  • Battery Dimension: 137x45x24mm 
  • Wire Gauge: AWG12# 
  • Wire Length(mm): 115mm

Pros:


  • Very reasonably priced at only $24.99.
  • Plug and play with pre-wired connectors.
  • Clear shrink-wrapped hard case design.
  • Fits most 1/10-scale short course trucks, monster trucks, and rock crawlers.

Cons:


  • Balance plug has bulky protection clip that can make placement in the car difficult without removing it.

Final Word:


While this is not our first pick for serious competition, this battery pack works great for someone who is looking to go backyard bashing, upgrade from a NiMh battery pack, and/or looking for a budget friendly LiPo battery pack.

How to Choose Lipo Battery for Quadcopter?

Lithium polymer batteries, more commonly known as LiPo, have high energy density, high discharge rate and light weight which make them a great candidate or RC applications.


By learning the basics about LiPo batteries, you will be able to read and understand their specifications.


 


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Battery Voltage and Cell Count (S)

LiPo batteries used in RC are made up of individual cells connected in series . Each cell has a nominal voltage of 3.7V . Therefore battery voltage is often referred to as how many cells in the battery (aka “S”).


1S = 1 cell = 3.7V
2S = 2 cells = 7.4V
3S = 3 cells = 11.1V
4S = 4 cells = 14.8V
5S = 5 cells = 18.5V
6S = 6 cells = 22.2V


For example, we call a 14.8V battery a “4-cell” or “4S” battery.


Voltage affects brushless motors RPM directly, therefore you could use higher cell count batteries to increase your quadcopter’s speed if your motor/ESC and other electroincs support higher voltage.


But a battery with more cells of the same capacity is heavier since it contains more cells. To make a 4S 1000mah battery, you could simply combine two 2S 1000mah, or one 3S 1000mah with an 1S 1000mah.


Nominal voltage for LiPo battery cell is 3.7V. However it’s not the voltage of the battery either when it’s fully charged or fully discharged. The number is come up by manufacturers, and It’s near the middle of safe voltage range, so I guess that kind of makes sense.


LiPo battery is designed to operate within a safe voltage range, from 3V to 4.2V . Discharging below 3V could cause irreversible performance lost and even damage to the battery. Over-charging above 4.2V could be dangerous and eventually cause fire.


However it’s advisable to stop discharging when it reaches 3.5V for battery health reasons. For example for a 3S Lipo, the max voltage is 12.6V, and you should land when the voltage reaches 10.5V (at 3.5V per cell).


LiPo Battery Capacity and Size

The capacity of a LiPo battery is measured in mAh (milli-amp hours). “ mAh ” is basically an indication of how much current you can draw from the battery for an hour until it’s empty.


For example, for a 1300 mAh Lipo, it would take an hour to be completely discharged if you draw a constant 1.3A current from it. If the current draw doubles at 2.6A, the duration would be halved (1.3/2.6=0.5). If you draw 39A of current non-stop, this pack would only last 2 minutes (1.3/39=1/30 of an hour).


Increasing your battery capacity might give you longer flight time, but it will also get heavier in weight and larger in physical size. There is a trade-off between capacity and weight, that affects flight time and agility of the aircraft.


Higher capacity could also give you higher discharge current as you will see in the next section.


Note that, 1000mAh = 1Ah.


C Rating (Discharge Rate)

Lipo batteries for quadcopters these days all come with a C rating. By knowing the C rating and capacity of a battery, we can in theory calculate the safe, continuous max discharge current of a LiPo battery.


Maximum Discharge Current = C-Rating * Capacity


For example an 1300mAh 50C battery has an estimated continuous max discharge current of 65A.


Some batteries come with two C-ratings: “continuous” and “burst” ratings. The Burst rating is only applicable in short period of time (e.g. 10 seconds).


Although C rating could be an useful tool, it has become mostly a marketing tools nowadays.


If C rating is too low, the battery will have a hard time delivering the current to your motors, and your quad will be under powered. You could even damage the battery if current draw exceeds safety rating.


When C rating is higher than what’s required, you won’t gain much performance improvement. Instead the battery would be heavier and you will be carrying extra weight that reduces your flight time.


Discharge Lead (Main Connector)

Rule of thumb, the battery connector should match the one you are using on your copter. If you don’t own a quad yet, choose one, and stick with it.


All Lipo batteries come with 2 sets of wires/connectors: a balance lead and a main lead or discharge lead(Except for 1S batteries which only have a main lead). There are quite a few different connectors used in LiPo batteries. The main differences are shape, weight and current rating.


1S Battery Connectors


LOSI  
Pico blade  
JST-PH  

1S connectors are tiny and have very low current rating. They are commonly used in brushed micro quadcopters.


2S-6S Battery Connectors


You will find a lot more different types of battery connectors in this category, in fact not all are listed here. But majority of them are not used that often so you don’t need to ever worry about them. For mini quad, the most popular connector is probably the XT60. for smaller one, usually use the xt30.


JST   Mainly 2S
XT30   Mainly 2S and 3S
XT60 Similar to the Above, only bigger Mainly 3S, 4S
XT90 Similar to the Above but even bigger  
HXT-4mm    
EC3    
EC5 Similar to the Above but bigger  
Deans (T)  

However since XT60 is only rated at 60A, and mini quad are running at higher and higher current and voltage, we might soon see a change in the popular connector used. such as xt90, EC5 etc.


Balance Lead

Balance lead is mainly used for balance charge to ensure all cell voltages are equal. It also allows you to monitor the voltage of each cell.


The number of wires in a balance lead starts at 3 for 2S LiPo, and for every increment in cell count, the number of wires also go up by 1.


Internal Resistance (IR)

Internal resistance exists in every battery cell, and IR could be different in each cell of the same LiPo battery. Higher internal resistance reduces the max current the LiPo pack can produce, that why as a LiPo battery gets older or overly used, you will find it losing the punch, or power.


IR isn’t shown on the label, because they can change over time. Lipo internal resistance increases with:


  • time/age
  • crashes (physical damage)
  • over-discharging
  • over-heating
  • other abusing usage

You can measure IR with dedicated tools, some LiPo charger even comes with IR measuring features.


LiHV

LiHV is a different type of LiPo battery, HV stands for “high voltage”. They are more energy dense than traditional LiPo battery, and allow to be charged up to 4.35V per cell. However there are mix reviews out there regarding the longevity of LiHV, as they might have decrease in performance sooner than normal LiPo’s.


How to choose LiPo battery for quadcopters?

To choose the best Lipo battery for your quad, you first need to know your requirement, the preferred cell count, and what would be the max discharge current.


Find Out How Much Current Your Drone Can Draw

Once you have decided on your choice of motors and propellers size, you should be able to find data online related to that requirement. For example, I am going to use this motor with 5040×3 props, at 100% throttle it draws 36.7A.


The total max current draw for a quad of 4 motors would be 36.7 x 4 = 146.8A at 100% throttle. If you want to play safe, you could just use this figure and find the battery you want. But for me, I usually discount it by 10% and that’s 146.8*0.9 = 132.1A because of the considerations we mentioned.


How Accurate Are Static Thrust Tests?

Remember that in real flights, the current draw is normally smaller than that from “static thrust tests” because of the moving air.


And notice that the current is significantly different between 90% throttle and 100%, and you should ask yourself how often you would fly at 100% throttle and does this matter to you.


Personally I fly mostly at 40%-80% throttle range, even when I do wide open throttle punchout’s they wouldn’t last more than a few seconds.


Current Draw of Other Components

There are other parts that uses power from the battery too, such as your FC, RX, LED, FPV gears etc. But it is very little compared to the powerful motors so we can usually just ignore them from our calculation. Or add 1A to 2A to the total current draw if you want to be a bit more precise.


Choosing the Optimal Battery Capacity for your Drone

Now you need to work out the battery capacity for the particular size of your quadcopter, and C rating required. Here is some general guideline I personally follow by the propeller sizes:


6 inch: 1500mah — 2200mah
5 inch: 1300mah — 1800mah
4 inch: 850mah — 130mmah
3 inch: 650mah -1000mah


Say if I was building a 5″ mini quad, and I want a relatively lighter build, I would go for 1300mAh (1.3Ah).


From there, I can calculate the burst C rating requirement using this formula:


Burst C Rating = Max Current Draw / Capacity


In our example, 132.1A / 1.3Ah ~ 102 C . Based on the specification of most LiPo battery manufacturer, the thecontinuous C Rating is normally half of the burst C rating , and that would be 102/2 = 51C .


Flying Style Affects Your Choice of Battery

However you might want even higher C rating than that if you plan to fly constantly in higher throttle than 50%.


That’s right, you have to take into account what kind of flying you plan to do, and whether weight or capacity is more important to you. Hard core racers will want the lightest possible batteries that are just enough to finish the racing course. But for “freestylers”, weight isn’t the only priority and larger batteries can be considered for longer flight time.


What Brand Should I Choose?

Avoid “no-name” batteries and stick with one of the known brands. Also avoid new brands and wait until it’s proven to have consistent quality. Some new brands make really good first/second batches, until they receive all the great reviews and everyone rushing to buy them, they begin to lower the quality and maximize profit.


Acehe, Tattu, Turnigy, Dinogy, Infinity and so on are some of the best brands out there. (sorry if I miss your brand please remind me know in the comment). Findlipo battery for UAV drone. And lipo battery for FPV.


How to Charge LiPo
Type of charging
  • Balance charge – The charger monitors the voltage of each cell, and can charge them individually while trying to keep them at the same voltage level. This is the safest and most recommended way of LiPo battery charging
  • Direct charge (fast charge) – You are charging through only the main lead, and the charger isn’t monitoring the voltage of each cell. This is normally faster, but it could result in unbalanced cell voltages and the battery might not be 100% charged
  • Storage charge – The charger brings each cell of the battery to their storage voltage, which is 3.80-3.85V
  • Discharge – The charger attempts to drain the Lipo battery (very slowly, even slower than charging)
Why Balance Charge?

Every cell in a battery is slightly different, after the battery is discharged, you might find that the cell voltages are all different.


If we were to direct charge this unbalanced battery without monitoring voltage of each cell, chances are some cells might end up under 4.2V (not fully charged), and what would be worse, some might go OVER 4.2V . If you remember, LiPo cells shouldn’t exceed 4.2V or they will become dangerous. Remember, over-charged = dangerous!


Most decent modern Lipo chargers are programmable and allow balance charging, and they should take care of this automatically.


Safety Rules

Incorrect handle of LiPo batteries could potentially cause fire. Please take your time to read through these safety rules before handling/charging batteries.


  • Pick up LiPo by their body, not the leads – wires could be pulled off from the fragile solder joints
  • Charge at safe places – It’s very important to find a fire-proof location to charge your batteries. Using a Lipo-safe bag is a good option, some even build a bunker for it.
  • Don’t charge your battery immediately after using it, wait until it’s completely cool down
  • It’s advisable to charge your battery at 1C or less (this is explained in the article “How to choose LiPo charger” by Oscar Liang
  • Never charge your battery unattended – regularly check if the battery is getting warm or starts to swell, if so stop charging immediately
  • Never use or charge a damaged battery – don’t charge if it is swollen (puffy) or has any other visible signs of damage
  • Ensure the number of cells and battery type are set correctly on your charger to match the cell count in your battery
  • Don’t over-charge, although this is normally taken care of by the charger, it would be a good idea to check cell voltages regularly
  • Don’t leave battery under the sun
Parallel charging

Parallel charging might not be the safest way of charging LiPo batteries, but it is probably one of the fastest for RC hobbyists. It allows you to charge multiple packs at once rather by one by one. However you do so at your own risk.


Charging 1S LiPo batteries

Charging tiny 1S batteries can be slightly different than doing the bigger packs. You can perhaps charge multiple 1S batteries using a parallel board (basically just combining them as one big 1S battery). But so far I found the best and fastest solution for me was to build a cable that connects multiple 1S batteries in series, and charge them as one single 3S or 4S, or even 6S pack. (Basically I am doing series charging rather than parallel charging).