RC NIMH batteries from eBay

[giguana]

there are lots of power sticks on eBay for fairly decent prices, I don't really know how the maths add up, is it possible to combine them and would they be any better than AA batteries? like if you have 5x7.2=36v 4ah batteries, does it combined to do 20ah?

i.e.
Find 4 RC 7.2V 3300mAh NiMH Battery For Tamiya Traxxas 7.2 V on eBay within Cars, Radio Control Vehicles, Radio Control, Toys Hobbies (end time 14-Nov-07 02:00:00 GMT)
eBay.co.uk - nimh 7.2v, Radio-Controlled, Power Tools, DIY Tools items at low prices

 

[flecc]

No, only one factor multiplies.

If five 7.2 volt 4Ah packs are in series (end to end) as you've said, that's 36 volts, 4 Ah.

If they're wired in parallel (side by side), that's 7.2 volts 20 Ah.

So series and the voltage adds up, parallel and the amperage adds up.

They'd perform better than AA batteries though, since they'll be larger cells, something like C or sub C size.
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[giguana]

Thanks,this is a really good resource all about bike batteries including nimh ...
Information about Battery Packs
it says that D-cell put out enough power for the motor, and there is even some info about DIY D-cell batteries.

 

[flecc]

Yes, NiMh D cells are the smallest that don't affect the performance in any way, though some C cells can get very close. Smaller NiMh sizes like AA aren't made to discharge at a fast enough rate.
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