Homebuilt ROVs Forum

I did not expect this question to be my first post (I have many questions, pressure transmitters, thrusters, cameras, communication, other sensor, etc!) but I find myself currently looking for Battery options.

I see Lipos, what does the C mean in eg'5000mAh 4S 30C'?

What other battery options are there?

How about rechargeable sealed lead acid batteries?

Jarubell

The C rating defines how much current that battery can deliver safely.

In your example:
5000mah is the same as 5AH. Don't know why they use mAH for these, but they do. So mAH devided by 1000 gives you ampere hours.
5Ah x 30C = 150 amps
If the battery had 20C it would "only" deliver 100amps.

I would not trust this 100% though. some cheap batteries might not be able to deliver what it claims.

Li-ion batteries would be a good alternative. they should be safer and still be light. Price will be higher.

Led acid I don't really know about. Easy to find and cheap, but heavy and bulky?