One CR123 out of a pair gone bad

Moonshadow

Enlightened
Joined
Jan 31, 2009
Messages
985
Location
Scotland
So the other day I checked the batteries in my Gladius. Two Energizer 123 primaries from the same batch, both dated 2018. Both measured 40% (I use an Ansmann Energy Check tester).



A couple of days later, the Gladius started giving me the double-blink low battery warning. Odd, as I hadn't used it much since checking the cells.



On re-checking them, one cell was still at 40%, but the other came up as 'Err', signifying a completely depleted cell (i.e. too low to even register as 0%).



The cells were installed as a pair, never used outside the Gladius. This particular Gladius does not have any parasitic drain issues - they've been in there for a few months without problems.



What could be going on ? Why would one cell drop to fully depleted with the other still at 40% ?
 
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