ExpertPower EXP1290, 12V 9AH SLA AGM Rechargeable 12V Battery Backup

My APC UPS-900 surge protector and battery backup has worked reliably for about 5 years, which is right in line with the typical 3–5 year battery life expectancy for units like this. It has kept my PC, modem, and router running through short outages, and also provides protection for sensitive electronics during surges. In longer outages, it has even powered a cordless phone and VOIP system for overnight operation. Recently, I noticed the backup time had dropped significantly—down to only a few minutes—indicating the battery was at end of life. I was initially unsure about replacing the battery myself, but the process turned out to be very straightforward. After installation, the unit is operating like new again. For a fraction of the cost of replacing the entire UPS, this was a very cost-effective repair. Given how simple the swap was and how well it restored performance, I would absolutely recommend replacing the battery rather than replacing the whole unit if you encounter similar symptoms.

I dropped it in my kid's 12v power wheels truck and it works great. Twice the endurance of the previous battery.

Size is comparable to the original batteries this replaced on my UPS (I purchased to matching) and the battery capacity is the same. Installation went well, just watch how things come apart so you know how to put things back together. I had an issue with one of the wires not staying in the channel and used a small plastic pry tool to hold in place so I could apply the tape that came off the original battery pack. Will see if these will last 4-5 years like the originals.

All I can really say about this battery is that it fits in the backup power supply I have but for how long it lasts or anything like that I don't know I put it in to see if it works and left the house didn't get a chance to trip the power to see if it did its job but we will give you a update report when the power goes out at the property let's hope that it works well and it beats buying a new power supply when all u need is to replace the battery

This battery was used in a gas scooter for starting. It is now a year old and the starter barely turned. The battery voltage looked good but fell to 9V under load, so I bought a new (different) battery. However, it did no better, so the battery wasn't the problem. I have hads a lot of batteries like this one fail a lot sooner, so I am happy with this battery manufacturer and would recommend them.

When Craftsman designed their Battery Start Lawnmower in the 1990's, they supplied a $90.00 small battery pack to start it with. It was 6 small D sized NiCad batteries inside a box that was used to start the mower with. The previous owner didn't want to spend $90.00 on a replacement battery that would go bad in a short time. Over the years the NiCad batteries deteriorated, and that is why I got my lawnmower for free from the sidewalk in my neighborhood. I modified the battery chamber to accept a small Walmart small lead acid battery, but they too seem to go bad in 2-3 years. I bought this 12 volt 9 Ah LiFePo battery to see if it will last longer than 2-3 years. It starts my mower much better than the Walmart lead acid battery, and now I have a fully functional 30+ year old lawnmower again. The lawnmower magneto recharges the battery when it is running, and I haven't had to charge the new LiFePo battery in between uses of the lawnmower at all. The onboard BMS system inside the battery manages the charging routine when the mower is running and it seems to recharge it well. Hopefully this battery will make my vintage lawnmower work for me for many more years. I am building a padded steel box to secure this new LiFePo battery to the mower deck because it is too large to go into the original small battery compartment of the mower deck. Stay tuned to see just how long this new battery technology battery lasts, but for now it is working very well.

I've had my Cyberpower 1500PFCLCD UPS for about 4 years now. I noticed that despite no indicated internal battery problems, the UPS would fail during brownouts or other equipment being turned on. It did not use to do that. To validate, when I have my UPS connected to the wall (with zero loads plugged into it) and I disconnect the AC mains from the UPS, the unit would insta-power off instead of staying on (and running from battery power). This is the classic symptom of a dead internal battery! Anyways, Replacing the battery was straightforward. I picked up a pair of these Expertpower EXP1290's instead of shelling out more than double for the Cyberpower (supposedly) original battery. In reality, the 'original' batteries are Leoch DJW12-9.0's. These batteries arrived about 3/4 charged (~12.74 VOC), in a well protected package. Delivery was quick (2 days). After replacement, the UPS now behaves normally and correctly stays on / runs from battery when it's disconnected. No error messages or other silliness. Also, for what it's worth these terminals on this battery actually fit the internal connectors 'better' than the original. Your milege may vary on that tho, I'm sure it's game of sub-millimeters. While I cant yet confirm if these batteries will last as long as the original; their value is spectacular when compared to the original batteries. Operation looks good. I will update this review in the next few months if anything untowards occurs -- which I doubt. Highly recommended!

*Many* UPS backup devices, from many different brands, use batteries with the same shape, voltage and connectors as this one. It's basically a clone of the APC RB17, or the Cyberpower RB1270B, and many others. But you should still check the exact measurements because in some models - like our CP1500AVRLCD - the battery compartment is a very tight fit. And some brands vary, even if slightly, in height, width or length. The original "OEM" batteries in our UPS were Leoch brand. They lasted 7 years and I'd love to get more, but they are very hard to find. I'd also had good experience with CSB and Yuasa batteries, but nothing was available when we needed it. I'm not sure how we chose this brand, but now I'm glad we did! It's been over three years, and when I tested the UPS today in battery mode, capacity was still 100%. Reading reviews of this and other batteries, I see that folks tend to always blame the batteries when things go wrong. Yes, sometimes that's fair. But I've had UPS devices fail or develop software glitches with perfectly healthy batteries inside. I've stopped buying APC, because two of the four I've owned went bad like that. Your mileage may vary. In our UPS, two batteries get wired together, then squeezed into the case like Houdini getting into a straitjacket. You need to reuse the connecting wire from the original batteries, but it's not rocket science. Cyberpower provides complete instructions and no doubt there are videos out there. Some other brands do the same thing. Note, these batteries will work sideways or on end -- but not upside down. Your device may need just one, or a different size altogether. So check your manual, and compare all the specs before buying! Hope this helps.