# substitute car or marine battery in UPS?

M

#### Matt

Jan 1, 1970
0
My Belkin 350 VA UPS has stopped working, and I find its (sealed lead
acid) battery is dead and won't accept a charge. I can't say that that
is the only thing wrong with the UPS. The unit is still under warranty.

First I wonder whether it is practical to try to take advantage of the
warranty.

Second I wonder whether I can just use an external automotive or marine
battery instead of the sealed lead acid battery that came built into the
unit. If so, do I have to do anything special when using the external
battery, maybe such as using a separate charger (maybe the UPS's charger
wouldn't be big enough)?

The battery in it is like:
http://www.batterysupplier.com/item.asp?n=LA1245

G

#### George Pontis

Jan 1, 1970
0
...

Second I wonder whether I can just use an external automotive or marine
battery instead of the sealed lead acid battery that came built into the
unit. If so, do I have to do anything special when using the external
battery, maybe such as using a separate charger (maybe the UPS's charger
wouldn't be big enough)?

A separate charger is not a good idea. The UPS circuitry may have the battery
floating at an unsafe voltage, and most external chargers will not even be as good
as the charger in the UPS. (A really good one would probably have a microprocessor
and measure battery temperature)

As far as substituting a different battery, that is also not a good idea. The
sealed lead-acid batteries have different construction than an auto/starting
battery. They also have slightly different chemistry which calls for a higher
charging voltage. An auto battery would draw too much current from the charging
circuitry, would lose water too quickly, and would wear out faster than expected
if it was cycled.

So ... I would first try the warranty. If that is no good, then see if you can buy
an equivalent battery at a reasonable price. You might have good luck with eBay.
You can often recycle the old battery at an auto parts store. These low cost UPSes
go through batteries much faster than would a good design, but people keep buying
them because the limitations are not obvious at the time of sale. Even the mid-
range UPS (e.g. APC SmartUPS) at $400 and up do not handle the batteries well. R #### ric Jan 1, 1970 0 Second I wonder whether I can just use an external automotive or marine battery instead of the sealed lead acid battery that came built into the unit. If so, do I have to do anything special when using the external battery, maybe such as using a separate charger (maybe the UPS's charger wouldn't be big enough)? Try a motorcycle SLA battery. Something in the 3-4 amp/hr. range. C #### Conor Jan 1, 1970 0 My Belkin 350 VA UPS has stopped working, and I find its (sealed lead acid) battery is dead and won't accept a charge. I can't say that that is the only thing wrong with the UPS. The unit is still under warranty. First I wonder whether it is practical to try to take advantage of the warranty. Err..thats why they have one. -- Conor If Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music. J #### Jess Fertudei Jan 1, 1970 0 Matt said: My Belkin 350 VA UPS has stopped working, and I find its (sealed lead acid) battery is dead and won't accept a charge. I can't say that that is the only thing wrong with the UPS. The unit is still under warranty. First I wonder whether it is practical to try to take advantage of the warranty. Second I wonder whether I can just use an external automotive or marine battery instead of the sealed lead acid battery that came built into the unit. If so, do I have to do anything special when using the external battery, maybe such as using a separate charger (maybe the UPS's charger wouldn't be big enough)? The battery in it is like: http://www.batterysupplier.com/item.asp?n=LA1245 Let the unit charge for a while with nothing plugged in. Then take a low power light like a Christmas window candle and plug it in. Look directly at the light as you unplug the supply: If the light stays on for just an instant then it suggests the circuitry may be good. If you hear a beep (if your unit has a beeper when it kicks in, of course) it suggests that the circuits worked but the battery only had 'uuuumpf' for a second or two. This test is not a guarantee... just a rule of thumb. Your battery appears to be a 4.5 Amp/hour unit... what it's charger might need to do to maintain a battery rated 10's or 100's times that might be more than it can take. That said... I have read (when wondering about this same issue) some folks who have done what you suggest, though I've not seen long term reports. My other thought is not associated to the charger's ability to function, but rather what about the associated gasses with marine and auto battery charging? Do you really want these in your home or office's atmosphere on persistent basis? I just recently replaced two 7 AH batteries in my 950 AVR. I picked them up at Batteries Plus and was surprised that the bill was only about$32 US
total. Considering it is a $175 unit, that's a good deal. I saw many batteries for much higher on the net, and some for the same with and without shipping included, so research well. Batteries Plus is springing up everywhere, look here: http://www.batteriesplus.com/ That said... I just snagged a 350 at Staples for$20 bucks on sale last week
for my son. Back to school time is a great time for UPS, at least in years
past, so watch for them this Sunday.

J

#### John Weiss

Jan 1, 1970
0
Matt said:
My Belkin 350 VA UPS has stopped working, and I find its (sealed lead acid)
battery is dead and won't accept a charge. I can't say that that is the only
thing wrong with the UPS. The unit is still under warranty.

First I wonder whether it is practical to try to take advantage of the
warranty.

Why not? I got 2 batteries from them under warranty. They even sent prepaid
UPS labels for the returns!

OTOH, I'm not sure I'd buy Belkin again unless the price was WAY right (again);
their monitoring software was a pain, and 2 batteries did fail prematurely...

Second I wonder whether I can just use an external automotive or marine
battery instead of the sealed lead acid battery that came built into the unit.
If so, do I have to do anything special when using the external battery, maybe
such as using a separate charger (maybe the UPS's charger wouldn't be big
enough)?

The battery in it is like:
http://www.batterysupplier.com/item.asp?n=LA1245

A motorcycle battery may be what you need; it may even fit inside the case.
OTOH, I wouldn't use a flooded cell battery in the house. Leaking acid and
escaping hydrogen gas could cause MAJOR problems. You would need a deep-cycle
marine GelCell or AGM sealed battery. Though the charger might take a long time
to fully recharge a bigger battery, it would give you a lot longer run time on
battery power. Also, the charger might not be able to properly detect the state
of charge of the battery...

M

#### Matt

Jan 1, 1970
0
John said:
Why not? I got 2 batteries from them under warranty. They even sent prepaid
UPS labels for the returns!

That makes it practical.

M

#### Matt

Jan 1, 1970
0
Conor said:
Err..thats why they have one.

Really? Think about it. Oh yeah, you're a genius.

M

#### Matt

Jan 1, 1970
0
John said:
Why not? I got 2 batteries from them under warranty. They even sent prepaid
UPS labels for the returns!

They will only send me a new unit, and I have to pay for the return
shipping of the old one. My application requires a serial port, and the
new one is USB.

L

#### Lyn

Jan 1, 1970
0
You'll probably discover that the battery is NOT covered under the warranty.

D

#### default

Jan 1, 1970
0
They will only send me a new unit, and I have to pay for the return
shipping of the old one. My application requires a serial port, and the
new one is USB.

There are sealed lead acid batteries available on the electronics
surplus market - mail Internet order

If it were me, I'd get a lawn and garden (tractor) battery. Twice the
capacity of a motorcycle battery at half the cost - and still small
enough AH rating so it won't kill the built in charger.

Sealed battery would still be choice number one - lots safer and
easier on the floor or furniture.

S

#### skylinux

Jan 1, 1970
0
Matt said:
Second I wonder whether I can just use an external automotive or marine
battery instead of the sealed lead acid battery that came built into the
unit. If so, do I have to do anything special when using the external
battery, maybe such as using a separate charger (maybe the UPS's charger
wouldn't be big enough)?

Will it work, yes. I live in florida and have done it during the last
hurricane we had in 2004. I was without power for 2 weeks and keept my
Computer running on UPS and generator.

You need a deep cycle battery, don't bother with Car or bike batteries,
they can't handle it.
PLEASE CONSIDER, your UPS is not designed for hours+ operations that you
will get from a large deep cycle battery. You must add cooling fan(s)
and heatsinks here to cool down components that get too hot.

I did not try charging the battery using the UPS circtuit. I used a
proper charger to charge the battery, then connected it and used it.

The UPS I used it on was a APC 1100VA

Skylinux

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