RC Helicopter Problem

[MikeSh]

presumption that higher capacity = greater current capability.

Generally true.
It's the 'C' rate.

 

[Black Hole]

There's an oops:

 

[Black Hole]

Generally true.
It's the 'C' rate.

Yeah, but there's another technical issue: now I know the difference between protection circuits, it is clear at least some of these higher capacity batteries are intended for lower current applications (the thin wires are a clue), for longer intervals between charges. That Aliexpress unit seems to have short fat hairy legs, but the protection circuit is clearly of the low-current type.

OK, so I transplanted the protection board as a trial, but there's no telling the actual spec of the cell behind it.

So I think the answer is to look specifically at spares for drones, and they seem to be marked "20C" - which I gather means (assuming a 1Ah unit) 20A? I guess that marking might have been one which got cleaned off my original battery.

Just as an example, this one:

2pc 3.7V 20C 1100 mAh Polymer Li battery 923048 For JJRC H8C F183 H8D Drone Qua | eBay

Find many great new & used options and get the best deals for 2pc 3.7V 20C 1100 mAh Polymer Li battery 923048 For JJRC H8C F183 H8D Drone Qua at the best online prices at eBay! Free delivery for many products!

www.ebay.co.uk

...but no weight specified (oops: see below).

 

[Ezra Pound]

...but no weight specified.

 

[Black Hole]

I made the mistake of looking in the specifications!



...however, if I had looked further down:



But I'm not very interested in this particular one, because it is not being stocked here. It gives me something to search for though.

 

[Black Hole]

So I think the answer is to look specifically at spares for drones, and they seem to be marked "20C" - which I gather means (assuming a 1Ah unit) 20A? I guess that marking might have been one which got cleaned off my original battery.

...although I notice a lot of products advertised as "20C" or "25C" are not marked as such. This is a minefield!