With an extra battery on hand, you'll never be without the power it takes to get the job done. The new BlackBerry Bold battery M-S1 is a long life 3.7 V Li-Polymer battery so you can always talk, type and work as long as you need to. Keep it in your bag or briefcase so you'll stay connected, powered up and ready to get the job done. This battery is the OEM RIM brand BlackBerry Bold 9000 Battery for the BlackBerry 9000 series, same as the one that came with BlackBerry Bold Device.