The Listman 21700 IMR "unprotected" battery has a capacity of 4200 mAh and a maximum discharge current of 25A. This battery is ideal for electronic mods (21700).
 
Type: battery
Model: IMR 21700
Lifetime: 800 charging cycles
Country of origin: China
Voltage: 3,7V Lithium-Manganese
Max current: 25A for 60s (pulsed)
Lowest voltage: 3 Volts
Resistance safety: 0.1 Ohm mini