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Unread 09-10-2008, 01:54
eugenebrooks eugenebrooks is offline
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Re: First: 2008 Batteries are D-Y-I-N-G.

Quote:
Originally Posted by Seth Mallory View Post
I would like to know what people are using to test their batteries and what standard they are using. Thank you.

Seth
We load our batteries at 20 amps, and measure the time that
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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