Hugo Vanwoerkom wrote:
My Back-UPS LS 500 is in need of a battery. How do I go about finding 
that locally? I.e what does one ask for? I know the battery it has 
and that is not sold locally.
I don't know the physical layout of the LS 500, but the packs are 
typically made up of standard sealed lead-acid batteries that are used 
for all sorts of purposes... fire alarms, industrial, etc.
To replace these is simple:  I just opened my UPS up, pulled out the 
pack -- which turned out to be two standard 12V sealed lead-acid 
batteries -- disconnected it (it's well marked for positive and 
negative, and in my case there was a "Y" cable with an in-line fuse 
holder between the two packs for current limiting), and took them to 
the local battery dealer.
I shopped a bit online and found batteries a couple of bucks cheaper 
(or really cheap in 10 packs - if someone has a lot of UPS's to 
refurbish), but the local store was convenient and their price was 
fair if I included shipping on the stuff from the Net dealers.
The local store also was nice because they took the two original dead 
batteries for recycling at no charge, and glued the two new batteries 
together to make up the "pack".
You could install them without gluing them together, for certain -- 
but it makes it a little easier to get them in and out of the unit 
with the front cover door down.
Slide the new "pack" in, reconnect the connectors and the in-line fuse 
holder that was hooked between the packs, and it was done.
APC also has a "trade-up" offer on their website where they'll give 
discounts on brand new units for turning in the old one (I believe 
they are even providing recycling services).  The prices weren't that 
great, but if you were out in the country-side and didn't have a local 
battery dealer, it'd be better than nothing.
If this is your UPS: 
<http://www.apc.com/resource/include/techspec_index.cfm?base_sku=BP500UC&total_watts=200> 
They have links on that page for battery replacement "kits" with and 
without their software.  You only need the battery.
That's definitely a standard single sealed lead-acid battery.  They 
sell that "kit" to replace it, but you can get that battery just about 
anywhere... Looking at the photos, I think that is a 7Ah battery, but 
let's see... a little Google...
<http://www.apexbattery.com/apc-back-ups-ls-500-ups-battery-bp500uc-ups-batteries-apc-ups-batteries-apc-back-ups-batteries.html> 
Yep.  7.5 Amp-Hour standard gel cell.
CDW wants $35.99 for the "official" APC branded replacement.
<http://www.cdw.com/shop/products/default.aspx?EDC=107245&RecommendedForEDC=209767&RecoType=AC> 
APC voids their "equipment protection" if you don't use theirs, 
supposedly...
If you're not worried about that, those batteries (if I got the right 
UPS above) are a piece of cake to find all over the place.
Make sure you recycle the old one.   Have fun.