ExpertPower Standard 12V 7AH Rechargeable SLA Battery, (EXP1270-2)

Works great

Exact dimensions are not given in the specifications. I had to return it as the width of the battery was 4mm longer. However it was working as expected. Please provide exact dimensions to millimeters in the specification.

I was setting up a NAS at home, and the batteries in my CyberPower ST135XLU were old, and not holding in even very short outages. I opted to try these rather than the CyberPower offered replacements. They turned out fine, fit right, easy replacement, of same quality externally as OEMs they replaced, and my NAS reports very good backup times when the power goes off and back on. They were a good choice.

I contacted Acorn to repair my mother's stair lift. She used it once and the batteries failed. When she finally told me about it her so called warranty was up. She paid over $4000 for the lift. Acorn quoted me a $650 service call fee and batteries would be an extra $100. I bought these batteries and installed them in about 10 minutes and saved over $700. I understand that Acorn has to make a profit but I feel they took advantage of a 90 year old woman and their repair costs are way out of line.

I bought these nearly 5 years ago. I've used them only sporadically to run a model glider winch, which needs a lot of current. I suspected they'd gotten old and bought replacements. Was the power output any better on the new ones? No, the old and new provided about the same power output. All four dropped about .45V when a 2A load was applied. That's an apparent internal impedance of around 220mOhm. A battery resistance measurement from a charger reported about 110mOhm on all four. Of course, a battery is not an ohmic device and the voltage has a settling time after a load is applied or removed, so it's it's tough to really nail a number without specifying test conditions. So ... not powerful enough for my application, but for modest power applications it should be great.