Testing AGM battery
Submitted: Tuesday, Jun 30, 2009 at 12:19
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bks
How do you
test a sealed AGM battery to
check if it is still OK. While it charges up Ok it doesn't seem to hold the charge. In teh wet acid batteries you could
test each cell to
check them.
Reply By: olcoolone - Tuesday, Jun 30, 2009 at 13:40
Tuesday, Jun 30, 2009 at 13:40
We use an electronic load tester but if you want to do it at
home you can connect a 55 watt halogen globe to a fully charged battery and see how long it takes to discharge the battery in hours and calculate the amps per hour.
This is a very crude way of doing it but if you have a 100 amphour battery that is fully charged and you only get 4 or 5 hours out of it then you know it is stuffed.
You have to remember a deep cycle battery will always deliver more amphours if the load is less... for example if you draw 1 amp per hour out of an 80 amphour battery you might be able to get 88 amphours but if you draw 20 amps out of the battery you might only be able to get 60 amphours of use.
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