Do you have a question? Post it now! No Registration Necessary. Now with pictures!
- Posted on
- Dead Battery?
- Mike Petro
February 14, 2007, 6:02 am
rate this thread
it no longer holds any charge what-so-ever. As in, I unplug the laptop,
and it turns off. Right before it started doing this, it would last
about 10 minutes and then turn off.
So is the battery just dead and gone? If so, can I revive it?
If the battery is not dead, how can I make it working again?
Re: Dead Battery?
Hi M.I.5¾ (I believe your first name is Mike, right?)! Remember months
back when I said I found a website that claimed that lead-acid batteries
should be exercised every 3 months or so. And I feel this is true for my
experience as well. But you didn't buy this belief. But I couldn't find
the URL for it at the time? Well I finally found it.
Which seems to be a dead link now, but archive.org still has a copy of
Btw, speaking about UPS. Mine (1000VA) will run my:
1) Desktop and LCD monitor for 4 minutes
2) Laptop with external LCD monitor for 30 minutes
3) Cordless Phone for zillions of hours, I quit the test at 8 hours and
the battery was still claiming better than 80% left.
This Powmax with a 7.5 amp 12v battery will give you a one minute
warning before the UPS shuts down. But for condition 1, the battery
drops so fast and dies before it can even give you a one minute warning.
Re: Dead Battery?
I still don't buy into it. The advice is based on a clear misunderstanding
of the lead acid chemistry. The sulphation phenomenon of which they speak
is where the lead sulphate deposit on the plates turns from a soft spongy
porous material into a hard relatively non porous material if it is left for
any length of time. The issue here is that lead sulphate is only present in
a lead acid battery that is at anything other than fully charged (it is one
of the discharge products). In a battery that is maintained in a fully
charged condition there is no lead sulphate present. Thus what is not
present cannot harden into a non porous form.
None of the manufacturers instruction sheets for any of the lead acid
batteries we deal with mention any requirement for periodic exercise (and
these are aircraft batteries which *must* be correctly maintained). They
just state that batteries in storage must be charged every 2 weeks.
- » Laptop won't post after cpu fan/heatsink replacement
- — Next thread in » Laptop Computers Forum