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Anonymous Posted on Sep 13, 2005

Can a lithium ion battery be overcharged?

Recently I bought a SONY DCR-HC40 camcorder, the SONY BC-TRP charger and an extra SONY NP-FP70 lithium ion battery pack (quick charge battery). I charged the battery that came with the camcorder (NP-FP50) in the SONY BC-TRP charger and, by mistake left the battery in the plugged in charger overnight. 1) Is it possible to overcharge a lithium ion battery by leaving it in the plugged in charger overnight, as I did? 2) According to the instructions for the charger, I can leave the battery in the charger for an hour after the charge light goes out (indicating a full charge) and the battery will charge even more. Are there any disadvantages in doing that? Thanks. Richard

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  • Posted on Sep 13, 2005
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Here's a small FAQ I found: 1) My lithium ion battery is the SONY NP-FP70 Battery Pack. Does the fact that the battery is called a battery pack mean that it has built in circuitry to prevent an overcharge? No. I write with some authority since I've dissected too many and there is no such circuit in the battery. From a system perspective it doesn't belong there. 2) Is there any way of knowing if my SONY BC-TRP charger has the circuitry for preventing an overcharge? You'll have to ask, but the key clues are: a. The documention tells you to not leave it plugged in overnight. b. The battery gets too hot and melts the plastic. 3) If I charge my battery in my camcorder (SONY DCR-HC40), can I assume it has the built in circuitry to prevent an overcharge? a. One can't assume anything. b. But from what I read on that model, you plug it in and forget about it. To do that, it would have a proper charge circuit.

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  • Posted on Sep 13, 2005
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Yes. But a proper charger will not do that.

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Sony DCR-HC40 Battery Charging Problem Hi Mates - I did purchase a Sony DCR-HC40 camcorder around an year back and it was working superb till few days back. As of date, i am facing a problem where...

Had the same thing happen to me. Went out and bought a new battery and it, too, does not charge. Apparently something messed up with the in-camera charging system. It will charge for several minutes (charge light illuminated) and then the charge light goes dark. Battery gage shows that there is virtually no time left on either battery (old or new). Anyone have any ideas other than a trip back to Sony?
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