BatteryShark UPS Battery Failures

Fully charged 48 volt pack in an APC DLA3000RM2U. Individual measurements made on pack with light load. The two cells marked with “X” are failed badly and there is a 3rd weak cell. Weak/failed cells were moved to one series string upon discovery so that the UPS would pass a self-test without shutting completely down and risking system shutdown.

Batteries are <12mo old and have <5min of cumulative draw on them. Float charge voltage shown in last photo. System runs with 9-11% load.

Cell 1 – 12.20V

IMG_20151229_011117

Cell 2 – 12.12V

 

 

 

IMG_20151229_011109

Cell 3 – 12.11V

IMG_20151229_011055

Cell 4 – 12.19V

IMG_20151229_011044

Cell 5 (weak) – 11.88V

IMG_20151229_011006

Cell 6 (failed) – 9.47V

IMG_20151229_010957

Cell 7 – 12.09V

IMG_20151229_010947

Cell 8 (failed) – 9.41V

IMG_20151229_010855

Pack voltage back on-charge (54.5V)

IMG_20151229_011426

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