Are my batteries shot? Charging question
Hi All, I have 2 70AH 12v batteries conected for ~140AH @ 12v. I have a 10A charger on them overnight and it still says about 4A going in at 15v . I'm thinking these batteries are no longer taking a ...
Forum Discussion
Waitin2Retire wrote:
Hi All,
I have 2 70AH 12v batteries conected for ~140AH @ 12v. I have a 10A charger on them overnight and it still says about 4A going in at 15v . I'm thinking these batteries are no longer taking a charge. One battery was half empty when I got the rig so I filled it with distilled water and charged it. Both batteries on resting read about 12.8v which indicates they are charged. Hooking up the charger to top them off I would think the amps would drop down to a trickle in a short time, couple hours? The charge started at about 8A and has tapered down to about 4A and not falling any lower. What are your thoughts?
Greg
You need to check their SGs and also note over time that the 4a stall is going on, whether the SG has stopped rising. If SG has stopped rising, then the charger is just making bubbles.
Is it stalled at 15v too? With a manual charger it should keep rising to the point the charger runs out of steam to get it higher on that size of battery. Would expect 16+v with the 10amper on 140AH Heftier charger, higher voltage it can force the battery to.
Yes, separate them where you suspect one is in worse shape so you can tell which one. Once both as full as you can get them, get a load test done on each one.
