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Rechargeable batteries. - Page 3

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Posted by vaughn on October 9, 2009, 10:46 pm

Actually Ray-O-Vac rates them at only 1.24 volts, not 1.5.  That will cause
reduced performance in some gadgets.  It all depends...



Posted by Jim Wilkins on October 9, 2009, 11:39 pm


Different chemistry. Renewals were the rechargeable alkalines
reputedly good for 25 cycles. The charging end point is around 1.6V
and one I just checked was at 1.585V after sitting at least a month.
They didn't handle abuse well and were discontinued some years ago.

Changing the subject, I bought a used Tripplite UPS real cheap a few
weeks ago and measured the run time with a 60 Watt bulb at 12 minutes.
After recharging it again the run time was 120 minutes. A battery
engineer at work told me that fully discharging the VRLA packs to 0
and then recharging (immediately) might recover even more of their
capacity, although the 120 Watt-Hrs at a 2 hour rate is quite
reasonable for a battery rated 216 W-H at 20 Hrs.


Posted by harry on October 11, 2009, 5:54 pm

I have seen battery chargers for sale purporting to charge ALL
batteries, even the non rechargeable ones.  How about that?

Posted by danny burstein on October 11, 2009, 6:15 pm


Our experience with them a decade or so ago was that they
were just this side of pure garbage... Using their own specific
charger they'd often leak, or would go into the "keep charging
forever" mode. And capacity dropped dramaticaly after a half
dozen charges.

We dumped them.

Manufacturers lie...

Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]

Posted by Jim Wilkins on October 12, 2009, 12:06 am

The later, darker grey ones seem to be more reliable, maybe the first
version had already destroyed their reputation.

They were a good solution to batteries slowly dying in unused
flashlights and VCR remotes. They certainly were NOT a general purpose
replacement for primary cells.


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