Compatible with Liftmaster 8550 485LM Evercharge Back-Up System 12V 5Ah UPS Replacement BatteryF1 Terminals Beiter DC Power

The seller is absolutely great. The connections on my garage door opener are 2 different sizes. When I mentioned that to the seller, he said he had an adapter and would send out to me no charge. Attached it as soon as it came and voila... I now have my battery backup up and running again!

Great replacement backup battery for a garage opener unit (chamberlain).I have also used this battery to supercharge my child's power wheels (originally equipped with a 6v battery), which has made the car much faster!

Other models were twice the price

Lasted 4 months in my garage door opener, my previous battery lasted over 2 years. No warranty. They told me I had to send the battery back (which would cost $20 in shipping) and they would test it, if there was a defect they would replace it.

Just installed in garage door opener, don't know about longevity yet.

A generic is a generic is a ... perfectly fine replacement for the Liftmaster battery backup system I was repairing, Liftmaster 475LM Evercharge Battery Back-Up System and it's actually rated at a higher capacity than the original, which is nice. Had to fab some pigtails, but overall saving my mom about $150 makes for a fair exchange. After I installed and tested the pair all seemed well, but after one test the "charge" light on the unit started flickering. It returned to normal after about 15 minutes and has been fine ever since, so I remain unconcerned. Can't beat the price, shipping was reasonable and fast.

Quick and easy to install

Got just a few weeks short of 5 years out of it.5 years is about all I ever expect to get from any lead acid battery, regardless of size, advertising claims, price or warranty.