Let's Make Robots!

Is this battery suitable?

Hi guys. I am looking for a power source for my micromouse. Say it requires 500mah and needs to last about 30mins. Would this do? http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7565 if  i bought 2 cells? It had a 20c discharge rate..

Thanks in advacne

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Hehe, straight to the guts of it CtC!

OP: 500mA for 30 mins means you need a 250mAh battery at the very least. I would suggest a 400mAh or higher to be sure you get 30 mins run time.

That battery powers this http://letsmakerobots.com/node/22568 for 5 minutes. So no.

Hi, do you need the battery to be capable of providing 500mA of continous discharge or pulse discharge?  I'm assuming you meant to write 500mA instead of 500mAh.  It looks like the battery you cited on Hobby King and put out 20*50mA or 1A continous, which is impressive for the size.  That battery should last about 50mAh / 500mA = 6 minutes, so five of those batteries might last 30 minutes.  The number of batteries needed can also be calculated by taking the 250mAh / battery capacity = 5.

I like these batteries for their capacity but they can't supply high continous current: