When you equip your mechbox with a harder spring, you want to ensure that the motor has sufficient power to start the load. One cannot, however, just look at the voltage level. You need to know how to determine your battery’s continuous current. mAh x C=mA, For example, With a 1500mAh, 10C battery, the continuous current will be 1500mAh x 10C =15000mA=15A per cell. A typical 11.1 Volt Li-Po battery has 3 cells, so the continuous currents will be 15Ax3 =45A. 45A is good enough for most 400fps / 25ROF configuration.
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