Casil 12v 7.2ah Rechargeable Battery - APC UPS Replacement Battery for SMT750US, SUA750, SMT750, (RBC48), UPS Batteries, 12V 7.2Ah Deep Cycle Batteries with F2 Terminal 2 Pack

I've ordered this batteries to refresh my 6 years old APC-UPS SMT750 which was beeping constantly because of completely degraded batteries. I received this batteries fully charged and without any leakage or other damages. Considering the fact that they were shipped for at lease 24 hrs, their 12.85V respectively 12.84V must have been a real charge and not some "let's charge them short before shipping". Because of SOC and assuming there were not charged additionally before shipping this cells must be pretty new. I did not test capacity, but there seem to be some issues: according to APC website my UPS model with genuine batteries should have a run time of 1hr4min @ 80watt load. But with this new batteries and after installation & calibration the unit shows only 2760 seconds (46min). This is only ~72% of what it should be, even less considering claimed 7.2Ah of this batteries compared to 7Ah of APC batteries! This makes me assume that the claimed 7.2Ah of this batteries are not accurate or something else is wrong. I also know that APC's claim of over an hour runtime is more like lab/advertising data and probably not real-life data. To be fair I gave 5 stars since you need to go through full capacity test for each battery to know the real capacity. I wasn't able to do this, but honestly for $/Wh price this batteries are still a good deal if they last at least 50% of genuine lifetime (in my case 6 years). Only time will tell. UPDATE: Estimated battery time in my UPS is showing 57 min. now. This is more acceptable than previous 46 minutes. I think the changing run time of my unit is an internal UPS thing and does not have anything to do with real capacity of the batteries. For now I'm very happy with this purchase. Longevity is still to find out.

Works well. Hope they last.

Purchased for a battery backup for a computer. Works fine.

Perfect replacement battery with very easy installation.

This battery replacement pack is the worst. I bought it thinking it would double the battery life, but I was completely wrong. The first battery lasted until May, and by September, I had to replace it with the second backup battery because it kept beeping. It’s February 1st, and the second battery is already dead, and the beeping doesn’t stop. I’ve been buying the “APC BackUPS ES 750 12V” type battery for a long time and never had this issue. They’ve always lasted me longer than a year. I will never make the same mistake, so if you read this message, save yourself a big headache and frustration by avoiding this brand.

Worked perfectly and was a direct replacement.

I bought this pair of batteries on September 1 2022 and the last time I tested them in January of 2024 they held up but today on June 16, 2024 they are dead. This is with 5 minute tests 2-4 times a year since they were delivered. I have used many brands of 7.2 ah SLA battery in my backup units over the years under the same circumstances that have held up at least 3 years. I see this is not the case with Casil batteries and I'll have to look elsewhere this time. I expected these to last another 6 months minimum.

You will need to use the existing wiring harness. And you will want to reuse the plastic battery separator/guide thing-a-ma-jig that is stuck on the top/rear of the batteries with double-sided tape. That is just a matter of peeling the connector and resticking it back onto the new batteries. Same thing pertains to the big plastic sheet that is stuck to the front/bottom of the batteries, that is used to pull the batteries out of the enclosure, just peel and re-stick it.

APC UPS that batteries were installed in indicated that they were discharged out of the box. Did take a charge.