I bought this replacement battery after my Goal Zero Yeti 1250 stopped holding a charge. It's a sealed lead acid (AGM) unit, and installation was straightforward once I opened the station. Capacity feels back to normal for my needs, mainly running small devices and lights during short outages. The 500-800 lifecycle rating seems reasonable for this type. One tip: it ships needing a charge, so top it up and remember to charge every 3 months if you store it. Solid replacement, just wish it lasted a bit longer between charges.