Rechargeable Birdog Satellite Meter Battery for Version(s) 2.5 / 3 / 4 SBP234 Compatible with Birdog Version 2.5 / 3 / and 4 3300 mAh of power NiMH battery pack 6 month warranty, includes free multi-tool. 2.6-L X 1.77-W X 1.77-H