Doublepow 9V 650mAh lithium rechargeable battery,High Capacity 650mAh Rechargeable 9 Volt Batteries for Smoke Detector/Alarms
Specifications:
Brand: Doublepow
Model: DP-9V 650mah
Name: Lithium ion USB - C rechargeable battery
Features: Economical and durable, small internal resistance, fast charge 1.5 hours full.
Voltage: 8.4V
Size: height 48 + 0.5mm, width: 26 + 0.5mm
Thickness 16 + 0.5mm
Can be charged 1200 times 
                                                                                                                         
Package Includes:
1 x 650mAh USB Rechargeable Battery