the canon bp-535 is the largest capacity battery for canon's zr series, consisting at its debut of the zr20, zr25mc. and 30mc the bp-535 lithium ion battery can be recharged at any convenient point; it is not necessary to wait until the battery is completely discharged, as is the case with certain other battery technologies 3450 mah according to tests, this battery lasts up to 8 hours 15 minutes when the camera's viewfinder is used, and up to 6 hours 15 minutes when the lcd screen is used this high capacity lithium-ion battery pack doubles the running time when compared to the bp-915. no memory allows charging at any time without the worry of lowering the battery life expectancy. the bp-930 will deliver up to 135 minutes of power when using the viewfinder only or up to 130 minutes when using the lcd screen. compatible with: vl-10li video light, es8400v, es75, es4000, es8200v, es8100v, es50, es55, es8000v, es7000v, es6500v, es420v, es410v, es60, es65, es300v, xl1/xl1s, gl1, gl2, elura*, optura*, vistura*, ultura*, zr* *requires ch-910