Question

If a LiPo battery shows significant voltage sag during a full-throttle climb, what technical specification of the battery is insufficient for the current draw of the motors?

Accepted Answer

The technical specification that is insufficient is the C-rating of the LiPo battery. A LiPo battery&#x27;s C-rating represents its discharge capability, which is the maximum safe rate at which the battery can release its stored energy. The actual current draw capacity of a battery is calculated by multiplying its C-rating by its capacity in Ampere-hours. Voltage sag occurs during a full-throttle climb because the motors are demanding more electrical current than the battery can provide under its current internal resistance. Internal resistance is the opposition to the flow of current within the battery itself; as the battery struggles to meet a high current demand, this resistance causes a portion of the battery&#x27;s energy to be converted into heat instead of voltage. This internal power loss results in a significant drop in the output voltage reaching the motors, which is perceived as the battery failing to maintain power under load. When the C-rating is too low for the load, the battery cannot sustain the required current flow without this sharp decrease in voltage.

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If a LiPo battery shows significant voltage sag during a full-throttle climb, what technical specification of the battery is insufficient for the current draw of the motors?