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Topic: PS to testing batteries after boost charge (Read 597 times) previous topic - next topic

PS to testing batteries after boost charge

Tested engine batteries with out disconnecting cable from terminals. All three read 12.57.
r.schwab
2004 U270 36'

Re: PS to testing batteries after boost charge

Reply #1 –
You generally get a higher reading right after boosting/charging. For the most accurate reading, battery manufacturers generally recommend waiting 6 hours after a charge before checking voltage.

You have to disconnect (isolate) each battery before checking voltage to get a proper indication of that particular battery's health.  With all batteries connected, you will always get the same reading from battery to battery.

Good idea to use a hydrometer also.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: PS to testing batteries after boost charge

Reply #2 –
Pierce has it right,
Also in our business starting batteries are most importnt, so we use a computer battery tester, that also checks condition of battery including the CCA Capacity of the battery.  If a problem shows up, we have found it is best to replace it. No one wants a dead battery at 2 AM when they need it bad.
Checking a battery while on a charger, is about useless, we take the surface charge off, then do the check to see what the actual condition is on each battery.
FWIW