79Whr RM280 money back satisfaction guarantee. 6 months warranty on cell, 1 year free of charge maintenance service (only 1 or 2 people request this (1 year customer care service) which is not battery cell problem, so I assume my battery all last more than 1 year, the rate of fail is very low because I give customer quality stuff). Sometime battery fail not because of cell, it is because the circuit board record an alarming activity, such as cell imbalance, overcharged, over-discharged, many of it can be restore back by manually balance the cell back and clear the error flag. Many customer reported my refilled battery last 2-3 years, it most strong in the first years even with heavy usage, if you use heavily (1 day 1 cycle), you can expect serious performance fade at second year, as it mostly last 200-300 cycles only (cheaper battery mostly last ~100cycles). I offer moderate pricing and good performance, double the price, triple the lasting!