ericfx1984
Solar Enthusiast
- Joined
- Oct 10, 2021
- Messages
- 756
So I have 4x Duracell GC2 FLA 6volt batteries... I was thinking that since they have some age it might be a good idea to test their capacity...
I was thinking that a simple way to do this would be to split the batteries in to a pair of 2s, rather than testing them 2s2p...
My thought there is that if there is one bad cell the capacity difference and HOW the 2s string behaves should be pretty clear.... in addition if I did test at 2s2p, and I did suspect a bad cell, I might have to break it down for further testing any ways...
So basically I am thinking test 1 would be the right side 2s
test 2 would be left side 2s
I figured I would charge up the individual 2s strings, attach a 100 shunt and meter... then i could monitor the load, maybe dial it in for 50ish amps and look at where the resting voltage it after 30 mins... I figure that would give me a good idea of how much was used, vs how much was left in reverse(looking at resting voltage)
this should allow me to have a good idea of how degraded the batteries have become
Finally IF one of the 2 strings is significantly lower than the other, then I would pull that string apart and test the resting voltages... the lower resting voltage should be a bad cell?
I COULD also try mixing the batteries from the lower testing string with the higher testing string and see which battery tests lower at that point.
Anything I am missing? am I going about this the wrong way?
I was thinking that a simple way to do this would be to split the batteries in to a pair of 2s, rather than testing them 2s2p...
My thought there is that if there is one bad cell the capacity difference and HOW the 2s string behaves should be pretty clear.... in addition if I did test at 2s2p, and I did suspect a bad cell, I might have to break it down for further testing any ways...
So basically I am thinking test 1 would be the right side 2s
test 2 would be left side 2s
I figured I would charge up the individual 2s strings, attach a 100 shunt and meter... then i could monitor the load, maybe dial it in for 50ish amps and look at where the resting voltage it after 30 mins... I figure that would give me a good idea of how much was used, vs how much was left in reverse(looking at resting voltage)
this should allow me to have a good idea of how degraded the batteries have become
Finally IF one of the 2 strings is significantly lower than the other, then I would pull that string apart and test the resting voltages... the lower resting voltage should be a bad cell?
I COULD also try mixing the batteries from the lower testing string with the higher testing string and see which battery tests lower at that point.
Anything I am missing? am I going about this the wrong way?
