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Poor Man's Battery Capacity Tester

 
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revenson(at)comcast.net
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PostPosted: Fri Dec 14, 2018 8:22 am    Post subject: Poor Man's Battery Capacity Tester Reply with quote

Recently built the tester described in "Battery Replacement: A Plan for Throwing in the Towel".

Then I tested it with a one-year old battery (PC-680). It operated 2.25 hrs. before the light went off. I thought this was pretty good.

I read 12v. at the battery immediately after test completion. That surprised me, I had expected it to be lower...maybe 10 or 11 volts before the light would go out.

But since the relay used was a 12v relay, I should have known a 12v relay would drop out at 12 volts! I learned something most of you probably already knew!
Roger E.

Have a blessed Christmas!

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user9253



Joined: 28 Mar 2008
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Location: Riley TWP Michigan

PostPosted: Fri Dec 14, 2018 8:56 am    Post subject: Re: Poor Man's Battery Capacity Tester Reply with quote

A relay will drop out at a MUCH lower voltage than its pull in voltage, perhaps one half or less. The battery tester relay drop out voltage is determined by the transistor base circuit. Very soon after the battery circuit is opened, the battery voltage starts to recover.

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