Malcolm Stewart
Guest
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 Posted:
Sun Oct 16, 2005 4:40 am Post subject:
Re: Sony NP-QM91D Lithium-Ion Battery not taking a full char |
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<David.H.Downing@comcast.net> wrote in message
news:1129403176.731428.112670@g14g2000cwa.googlegroups.com...
| Quote: | I've got a Sony digital camcorder that I'm using with the Sony NP-QM91D
Lithium-Ion Battery, and I can't seem to get it to take a full charge
anymore. It used to go up to about 430 minutes and now I can't get it
to go above 405 minutes -- and I'm even having trouble doing that. The
FULL indicator will come on at about 355 minutes and I have to
disconnect and reconnect the power cord several times to get it up to
405. To be fair, I've had the battery for about a year now. Do they
just start to lose their OOMPH after awhile, or is something wrong?
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My "71" version of this battery is similar, with lower figures, as you'd
expect, but it was poor from new (see below). I've improved mine a bit by
discharging it through two 22 ohm 10W resistors in parallel. (11 ohm is
comparable to camera's load. They get quite hot.) Battery cuts out when
voltage drops a little below 6V. Then recharge and repeat*.
Funny thing in my case is that my 2 year old battery (without a charge
oindicator) does much better than the newer one needing this treatment,
which was bad from new and taken out of a sealed Sony blister pack.
*If you Google for "Lithium ion batteries" or similar you'll find that
Li-Ion degrades a little each time its charged.
--
M Stewart
Milton Keynes, UK
http://www.megalith.freeserve.co.uk/oddimage.htm |
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