Hitech RLI-9720 9V Lithium-Polymer batteries have ultra high capacity and double the power of regular alkaline or typical rechargeable Ni-Cd/Ni-MH rechargeable 9V batteries.  With capacity of 720mAh, these batteries can power your devices twice longer and excellent for hungry power devices.

Recommended for wireless microphones, TENS units, guitar effect pedals, wireless guitar/bass systems, in-ear monitors and other devices using 9V size (7.4V nominal voltage) battery.

• Ultra high capacity, 720mAh (20% higher capacity compared to RLI-9600)
• 2 to 3 times capacity compared to typical Ni-MH 9V rechargeable battery
• 5.32WH, High energy density battery 
• Light weight. Only weighs approx. 56 gram (1.97 oz)
• High performance
• No memory effect

Source:

1) Specification Sheet - Hitech RLI-9720 Li-Poly 9V 720mAh Rechargeable Battery

2) MSDS Sheet - Hitech RLI-9720 Li-Poly 9V 720mAh Rechargeable Battery

3) FAQ - Hitech RLI-9720 Li-Poly 9V 720mAh Rechargeable Battery