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Re: Max voltage drop for 6 volt...
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Posted by RKS on May 22, 1999 at 16:47:23 from (152.204.164.79):
In Reply to: Max voltage drop for 6 volt... posted by Mey on May 22, 1999 at 16:18:42:
Mey, I've got an answer that I'll defer in advance to a more qualified poster, when they come. However, generally, you can safely assume that any lead acid storage battery (automobile type) under load should maintain approximately 85% or more of its rated voltage, and I think that is regardless of the voltage. So, 85% of 6 is about 5.1 volts. Does this mean chunk the battery if it is pushing 5.1? No, but if you become suspicious at 5.1 or 5, or 4.8 - then the battery is either still good and will maintain that capacity for some time, or you have begun to lose a cell and soon there won't be a question and the battery will really kick down. All this depends of course on the amp rating of the battery and the amp requirements of the system it is used in. Also, marginal batteries are more temperature sensitive than good batteries. If you drop kick it to 5.1 in the afternoon at 80 degrees outside, then it kicks down to 4.6 or so in the cool morning, it's probably in a death spiral. I would always trickle charge the battery to full, for confidence that the charging system is not at fault, and then turn on the lights and hit the starter at the same time. Both of those together will expose a marginal battery, but both of them together will not pull down a "clearly good" battery, even with several full load tests back to back. RKS
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