>BB> I just went down and got me some of those great big binding 
 >BB> posts and drilled me two holes in the back wall of the UPS near 
 >BB> the upper right hand corner just above the top level of the 4 
 >BB> gel cells it cane with. 
 > 
 > This one's got two gels in there,  and I don't know if there's 
 > enough room for a pair of those binding posts,  it's really a pretty 
 > small case.
Roy,
 I have 2 Topaz UPSs, both bought with bad batteries. One is 800VA, the other 
1000VA, and they used a pair of 12 Volt batteries about the size of that in a 
small garden tractor. I removed them and installed binding posts like Bill 
did with his, using welding cable to connect each to a pair of 12 Volt 
RV/Trolling batteries. 
I used "arch punches" to make insulating washers from a plastic jug, and 
1/4-20 brass bolts for the binding posts. There's 3 insulating washers per 
post, 2 large ones about 1" dia. and a small one that's about 3/8" O.D. X 
1/4" I.D. The I ended up with: the bolt, the lug on the wire, a large metal 
washer, large insulating washer, the back panel of the UPS, the small 
insulating washer, large insulating washer, large metal washer, and 1/4-20 
nut in a stack. Install the wire with a 1/4-20 wingnut to make the 
nnection.
As Bill pointed out, the charging is very slow, being limited to about 1 Amp 
max. I think these are 105 AH batteries, so it could take 3 or 4 days to 
charge them if they were "dead". Not a big deal for me, as we seldom get 
outages that last more than a few seconds. The one fly in the ointment has 
been relatively short battery life, they seem to only last 3 years or so. I 
think that's due to their never getting an equalizing charge, so I've started 
doing that on a farily regular basis. Every month or 2, I hit them with 5 
amps continously for 5 or 6 hours.
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