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#25
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Re: First: 2008 Batteries are D-Y-I-N-G.
Quote:
it takes to drop to 11 volts. We don't go all the way to 10.5 volts because deep discharge is not good for the battery. We load using a constant current device, but you can do a reasonable job with high power resistors from digikey. We qualify our batteries every season, tracking their performance year to year. You can make yourself a tester with high power resistors, a fan to keep them cool, and a spike. It is not a constant current load, but it is close enough. You can measure the voltage using a voltage divider hooked to an analog input. The old EDU RC is very good for this. It is a great project for your robot team to do, producing a load tester that will get used every year. Eugene |
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