Universal Compatibility: The VX4 supports a vast array of battery chemistries, including 3.6V/3.7V Li-ion (including 21700 protected cells), 1.5V Li-ion (AA/AAA), 3.2V LiFePO4, and 1.2V Ni-MH. It accommodates various sizes, from small 10440s and AA/AAA batteries to larger 26650 and D cells.
