Airsoft Li-Pol and Li-Ion batteries
They gained popularity for these reasons: real 100% usable capacity even with strong springs, very hard source, good purchase price, no self-discharge. Everything can not be perfect, so there are also disadvantages such as low mechanical resistance, very vulnerable to damage from overcharging and tamping, greater wear of the motor. Please note that if the battery voltage is too high or the number of "C" indicates a high rate, which can prematurely wear out the plunger, bicycles or motorbikes in the gearbox. Rate of the fire must always be "healthy".