nimh battery cells

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etec
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Joined: Tuesday, January 23, 2007 - 18:31
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nimh battery cells

im putting together a nimh battery.all the cells are 1.2 volts,but some of the cells are 1500mah and some are 3000mah. will the battery pack work properly if i put them all together in one pack?

NickF23
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Joined: Saturday, November 18, 2006 - 10:25
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kinda complicated question.

kinda complicated question. we need more info. How big is the pack size (voltage, amp hour etc) what motor you using it with?

etec
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the battery pack will have

the battery pack will have 21 1.2V NIMH cells. the motor is a 450 watt brushless. about half the cells are 1500 and half are 3000 mah.

NickF23
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As I understand it there are

As I understand it there are 2 reasons why your pack wouldn't work. First is that a pack of 3 or 1.5 AH capicity will be too small give the motor what it needs - voltage would sag and they would heat up and probably die. To answer you question directly its risky to add batteries of differing capcity in a series string. say you had 10 3ah batts and 10 1.5 AH batts in series to make a 24 volt pack. When you use up more than 1.5 AH of energy half the cells are empty yet half will give out power. when discharging a battery below it capicity you can create a cell reversal which will damage it. for more info on ebke batteries see here.

http://www.ebikes.ca/batteries.shtml

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