What is the "temp-comp" feature all about in a dc power system? The 2V cells in the big battery stacks require 3mV/cell/t° by manufacturing standards. Therefore, 0.003V per cell change (up/down) by the charging system in response to each degree variation. The calculated voltage factor is programmed into a rectifier/charging system. The factor must be adjusted to match the battery type, size and nominal voltage operation. The most common factors are listed below as examples. By Formula ...