Let me ask you, what is the difference between the two?
Do not go for the obvious like size and color, both batteries are the same width and height but the white one is less than half the length.and about half the weight as well.
They are also both the same voltage, but the brown is 14v 3000Mah
the white one is 14v 4000Mah.
In case you didn't know these are lithium Ion batteries.
They charge to the same voltages and discharge to the same voltages, they can be used with the same chargers as lithium polymer batteries but as you can see are much smaller and more durable.
This is because they are similar to AA batteries, they have a metal casing.
This means any crashes are less likely to kill your battery.
So I will be building these packs to sell on for you guys.
You can build them yourself if you like just have a google for some sources to buy the cells from.
I am planning to sell 4500Mah 4s size wise they are a tad smaller than a 2200Mah 3s Lipo and a bit lighter.
I am aiming to sell them for about £8-£12, a equivalent lipo
(cheapest on hobbyking was £21.50)
And 4s 1000Mah
This is about half the size of the white pack above.
The reason i wont be selling the white pack 4000Mh 4s is due to supply issues but i may in the future.
but in the future i want to expand
3s 45000Mah
3s 4000Mah
and custom batteries will also be on the agenda.
If you are interested in these packs, have a look on blog history, another member of DIYdrones has posted about them previously,
and if you would like to buy a pack now, i will start selling the 4500Mah packs in about 3 weeks after further testing and built technique experimenting.
Just PM me.
Comments
hehe, i said current not capacity.
I didn't say cells in parallel doesn't increase the capacity. I said it doesn't increase the C rating. Maybe I wasn't very clear. Hopefully this is better: Say you want a battery pack with 10,000mah of total capacity. If you made it using a single cell (thats a big cell haha) that was 1C it would be capable of delivering 10amps. If you made it using 10x 1000mah cells that were rated at 1C each in parallel the total capacity would still end up as 10,000mah and still only capable of delivering 10amps.
no that's not correct. in parallel current capability is increased in series voltage increases.
@Jared
Just to reiterate using multiple batteries in parallel does not effect the C rating for same total capacity. 10 cells in parallel of a 1C 1000mAh battery can deliver the same amount of amps as a single cell 1C 10000mAh pack, 10amps. So it basically comes down too which config is lighter/fits given the same C rating of the individual cells to create the desired capacity.
nope i assure you its li-ion
ohh ok, sounds interesting.
ill post a video of them being used with my multirotor soon, but i think using low capacity batteries in parallel will give the c rating needed for most Models
Ok, so what really is the C rating of these batteries?
My mapping heli uses 4S2P batteries, for 16V @ 10,000 mAH total. It flies for 20 minutes, ergo is drawing about 30 Amps. If I could use these, I'd get about 40 minutes, and would be a very happy man.
So when you are testing batteries and finding their max discharge rate you can use Amps divided by Capacity(in Ah not mAh) to solve for the C rating.
Gary is pretty close for explaining the C rating. Basically "C" x "Ah" = amps. Starting with a 2C 5000mAh cell you can pull 10amp (2C x 5Ah). So when you put 2 cells of 2C 5000mAh packs together in parallel the C rating doesn't increase, the capacity does to 10000mah (10Ah). So the C rating is still 2 but you can pull 20amps since you doubled the capacity. Putting cells in series has no effect on the C rating, capacity in mAh or Ah (Wh is a different story), or the total amps that can be pulled. It only effects voltage.
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