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[OM] Eneloop "Hybrid" cells damaged.

Subject: [OM] Eneloop "Hybrid" cells damaged.
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Tue, 19 Feb 2008 19:00:49 -0800 (PST)
I have been using Enellops now for quite a while , but recently managed to 
damage a cell by deep
discharging a set of 4 cells in a FL40 flash.  This is no great surprise, deep 
discharging a set
of cells often reverse charges the weakest cell and can damage it. 

It depends on the device, as better devices automatically switch off, if the 
battery voltage gets
too low, often saving the battery. 

In this case, one cell is now only 1800mAh, versus almost 2200mAh for the 
others. It does mean
that the cell is likely to get more severely damaged now, as it will typically 
get reverse charged
almost every full discharge, because the capacity disparity is so great. 

Moral of the story: try not to fully discharge Eneloops, (or any other set of 
cells froming a
battery for that matter). If you really want to deep discharge to prevent 
"memory" etc, then only
do so to individual cells. 

Tim Hughes

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