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Meanwhile, I have some readings from the hydrometer for some (not all) of my battery bank. There are 8 batteries listed below; 6 cells each. Is there anything here that gives an indication of a bad cell? I noted for example on battery D4 that two cells were much lower than the others; is this the sort of thing we're looking for? Also, D1 and E4 are at very different levels; is this a sign of a problem?
Hydrometer Readings:
Battery D1: 1.15 1.12 1.13 1.14 1.13 1.13
Battery D2: 1.16 1.18 1.18 1.18 1.18 1.19
Battery D3: 1.19 1.19 1.18 1.17 1.18 1.16
Battery D4: 1.18 1.16 1.17 1.16 1.12 1.10
Battery E1: 1.15 1.16 1.18 1.16 1.15 1.18
Battery E2: 1.14 1.15 1.16 1.14 1.14 1.16
Battery E3: 1.20 1.19 1.20 1.19 1.19 1.18
Battery E4: 1.23 1.22 1.22 1.22 1.23 1.23
I shall finish off the readings later this evening; there are 120 cells to check; it takes a little time. The batteries are relatively young. They haven't yet been in service for a year and during that time the system has often been disconnected for work/modification. They should be in good shape.