This is the smallest battery in size that we have.
3.7Volt Li-Ion Rechargeable Battery
Rated voltage: 3.7V
MSRv007, MSRv009 or MSRv010 runs on this battery: 40 hours
Protection circuit: No
Standard charging current 0.2C, its charging current is 0.8mA.
Maximum charging current： 0.5C
Maximum discharging current： 1C