Posted by Indiana Ken on March 21, 2012 at 06:14:23 from (66.249.234.218):
In Reply to: Battery Charge posted by Cedric on March 21, 2012 at 01:41:08:
There are various charts showing the battery voltmeter readings versus state of charge. I have one taped to the back of my voltmeter. The reading will vary based on the type of battery. The following example is from a Yuasa catalog and is what I use - for 6 volt batterys simply divide by two.
Battery Type: State of Charge - Voltmeter reading
Maintenance free: 100% = 13.0 volt : 75% = 12.8 volt : 50% = 12.5 volt
Lead antimony: 100% = 12.7 volt : 75% = 12.5 volt : 50% = 12.2 volt
Lead calcium: 100% = 12.6 volt : 75% = 12.4 volt : 50% = 12.1 volt
The problem with the voltage measurement is that one needs to know the battery type. Conversely, many modern batterys do not have removeable caps to allow checking the gravity.
Typically I find batterys will check about 75% charged from the store. Yesterday I bought a lawn tractor battery from Mendards straight from the "on sale pallet" - it checked around 75% - I always charge before placing in service.
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