This mobile battery is compatible with OnePlus One BLP571.Battery is brand new and provides backup as good as original battery with the mobile phone. It Is Compulsory That After Receiving The Battery Put Into Your Phone And Plug Into Charge For 3-5 Hours Continuous Charge In Switch Off Mode For First Time Not Less Than And Not More Than That. This battery is the best alternative for your great phone and will never explode or give any problems.