Picked this up as a replacement for my Goal Zero Yeti 400 when the original battery stopped holding a charge. It's a sealed lead acid (AGM) unit, and the listing notes 500-800 lifecycles, which seems reasonable for this type. Installation was straightforward since it's the exact replacement for the Yeti 400. One thing to remember: it needs a charge every 3 months if sitting unused, so don't let it drain completely. Does the job and keeps my station running.