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9.4

NiMH batteries - max safe discharge? Big pts!

Asked by BlewItUp in Miscellaneous Hardware

Tags: 121aam

I'm working on a robotics project with two 300ma@24VDC gearhead motors. The trouble is, when stalled they rocket up to 2A each!! I plugged in a power supply I had and the short-circuit current was 1.2A (although it was rated 500ma...). However, when I plugged in a motor and stalled it, I read over 2 amps! Holy sh__! (I no longer wonder about the unfortunate results of using that poor 600mA h-bridge) Need to read up on inductive loads!! I plan to use two motors at once, and for a battery I've got 20 1200mAh 1.2V cells, totaling 24 volts. The cell chemistry is Ni-MH and the type is 121AAM (1.2Ah, 3/4-AA size).

My question is:
Is it safe to pull 4 AMPS off this pack?
This robot is for a creativity competition and they're very safety-concerned. If something explodes or cells start venting, the judges might not be too impressed...

I'm adding points...
[+][-]02/12/03 07:16 AM, ID: 7934140Expert Comment

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[+][-]02/12/03 09:04 AM, ID: 7935009Accepted Solution

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About this solution

Zone: Miscellaneous Hardware
Tags: 121aam
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Solution Provided By: jhance
Participating Experts: 4
Solution Grade: A
 
[+][-]02/12/03 12:27 PM, ID: 7936484Expert Comment

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[+][-]02/12/03 10:30 PM, ID: 7939831Expert Comment

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