In article , Mark
wrote:

I have a back-UPS 400 with a useless gelcell. However, touching
terminals of a fully charged and healthy gelcell to the battery
leads causes mega amps to flow, so something is likely fried.
Interestingly, the dead battery has about 10.5 volts on it,
in-circuit, no current!

This is the classic symptom of a 12-volt lead-acid battery with one cell
shorted. Hooking a 12-volt battery to a 10-volt battery will draw lots
of current, as observed. Replace the old gelcell battery with the new
one; do not keep the old gelcell in the circuit.

Joe Gwinn

Do you have to worry about fumes from the car battery, or do you only use
the "sealed" type of car battery?
==================
The 'fumes ' you refer to are hydrogen and oxygen ,with hydrogen potentially
dangerous when not vented.
That's why I keep non-sealed lead acid batteries on a well ventilated loft.

BTW : Hydrogen has such a low density that , as tests (not by me ) have
proved , it is impossible to ignite hydrogen released from vertically
positioned tubing by a naked flame located at a distance of more than 100
mm ( 4 inches) from the hydrogen exhaust.

Providing this info does not mean I wish to encourage anyone to 'mess about
with hydrogen'.
It is only to show that hydrogen doesn't spread throughout an enclosed space
but ,upon release, moves upwards very rapidly .

Frank GM0CSZ / KN6WH

"Too_Many_Tools" wrote in message
oups.com...
I am the "lucky" owner of a number of older UPSes.

So what can a person build out of these?

The batteries are for the most part dead but the remainder of the
components seem to be in good condition.

Any suggestions?

Thanks

TMT


Time Machine!

I apoligize if I posted too widely....I posted to the groups that I
thought might have an interest and I would be revelant information
from.

And I suspect I am not the only one with an extra UPS laying around
looking for a second life.

TMT

On Mon, 21 Nov 2005 16:23:03 GMT, "Tom Gardner"
wrote:


"Too_Many_Tools" wrote in message
roups.com...
I am the "lucky" owner of a number of older UPSes.

So what can a person build out of these?

The batteries are for the most part dead but the remainder of the
components seem to be in good condition.

Any suggestions?

Thanks

TMT


Time Machine!

For that..you need a British phone both IRRC.

Gunner

"Pax Americana is a philosophy. Hardly an empire.
Making sure other people play nice and dont kill each other (and us)
off in job lots is hardly empire building, particularly when you give
them self determination under "play nice" rules.

Think of it as having your older brother knock the **** out of you
for torturing the cat." Gunner

"
For that..you need a British phone both IRRC.

Gunner


I need a new battery for my Tardis!

Tom Gardner wrote:

"
For that..you need a British phone both IRRC.

Gunner


I need a new battery for my Tardis!

Borrow one from K-9...

Pete C.

Um, I didn't make myself clear, I guess - I took the old one out,
clipped to the new one, instant heat. Big heat.
I'm guessing that there's circuitry which avoids draining the
(bad) low voltage one past a certain point. I'm also guessing
that a fully charged battery (the one I tried to hook up) enables
current flow, and that perhaps the input of the invertor section
is shorted. I didn't feel like leaving a perfectly good 17A-hour
battery to fry itself and the surrounding wires etc.....

BUt thanks for the response / mark


Joseph Gwinn wrote:

In article , Mark
wrote:


I have a back-UPS 400 with a useless gelcell. However, touching
terminals of a fully charged and healthy gelcell to the battery
leads causes mega amps to flow, so something is likely fried.
Interestingly, the dead battery has about 10.5 volts on it,
in-circuit, no current!


This is the classic symptom of a 12-volt lead-acid battery with one cell
shorted. Hooking a 12-volt battery to a 10-volt battery will draw lots
of current, as observed. Replace the old gelcell battery with the new
one; do not keep the old gelcell in the circuit.

Joe Gwinn

Would a 12 V deep cycle- Optima work in a APC-UPS 1400R I keep my servers
and dyno on with it along with some routers and switches. I don't know the
output, the battery fails and I now have it frightfully bypassed. The
batteries died and are almost 2 bills to replace. voltages ? issues? but I
have a few Optima batteries from wrecked race cars that would be perfect!

Any input would be appreciated,
Rob


Fraser Competition Engines
Chicago, IL.
"Pete C." wrote in message
...
Tom Gardner wrote:

"
For that..you need a British phone both IRRC.

Gunner


I need a new battery for my Tardis!

Borrow one from K-9...

Pete C.

RDF wrote:

Would a 12 V deep cycle- Optima work in a APC-UPS 1400R I keep my servers
and dyno on with it along with some routers and switches. I don't know the
output, the battery fails and I now have it frightfully bypassed. The
batteries died and are almost 2 bills to replace. voltages ? issues? but I
have a few Optima batteries from wrecked race cars that would be perfect!

Any input would be appreciated,
Rob

Fraser Competition Engines
Chicago, IL.

Unlikely, but while the replacement batteries may be, as you say 2
bills, from APC, if you take the old ones to a proper wholesale battery
distributor they will in all probability be able to sell you proper
replacements for about $20-$25 ea.

Pete C.