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I've read posts elsewhere here and have had similar experiences with a laptop, where if the main battery is flat or removed from the device that the backup battery is used and this happens quite fast. Possibly the main battery was removed but the backup battery left in when it was sent to you?
I beleive that the Dell backup batt is a throw item used to keep the contents of ram only when a user changes batteries.
btw, I have 2002 rom A02 and it "seems" to read the batt level ok.
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