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[Patrick Henry]

Apart from the blindingly obvious(size, weight and price)what's the difference between a five cell pack of 2900a/h AA sized nicads and a five cell pack of 2900a/h sub-C sized nicads?

Space is at a premium and I could really do with using the smaller cells if possible, but will run time/endurance suffer if I do?


Rich

[Colin Bishop]

I think it's just a question of Form Factor. Both sets should perform identically.

I suspect you may find that the weight is the same.

Colin

[Patrick Henry]

That'll do for me...thanks Colin, small one it is.


Rich

[Flying Sparks]

Rich

I think you will find there is a difference. The AA size cells will have a much higher internal resistance and will not be able to deliver high current. They will be OK for very low discharge uses, but as soon as you put a load on them like a motor or even multiple servos they will discharge very quickly. If space is at a premium have you considered LiPo or LiFo cells? They will deliver higher currents and be very stable but do require the correct charger.

As they say you don't get out for nowt

Hope this helps

Phil

[Patrick Henry]

I did consider them briefly Phil, but I'm not that good on these new fangled things. They will be used to run the motor(385) three servos and an Action esc, and another pack to run the ballast pump.

Rich

[Flying Sparks]

did consider them briefly Phil, but I'm not that good on these new fangled things. They will be used to run the motor(385) three servos and an Action esc, and another pack to run the ballast pump.

Rich

I would not expect much from AA cells then for this purpose. Sanyo Eneloop 2000ma AA cells are reckoned to be the best high capacity cells for their size available, but again not for high discharge use.

Phil.

[Damien]

Rich,
I have made 6 packs of Beecroft 2800mA AA cells in my Sub Chaser Catamaran ans Seaport, the Sub chaser runs 12v motor from hair dryer no problems running an hour a week for 3 weeks without charging between runs. 2 of the AA's in my cordless mouse last 6 weeks really excellent quality batteries.I bought these from an Aussie seller on ebay
Beware the chinesse one's i've thrown 40 AA cells away for the reason Phil stated they self discharged in around 4-5 days and wouldn't supply much power to run a motor, best i got was a week used in my mouse.

Their web sit  http://battery.beecroftsystems.com.au