- Enter setting mode by pressing and holding the button for 2 seconds. The mode light (type battery 1) flashes and the string number LED stays on. A short press selects the battery type. - After the battery type is confirmed, hold the button for 2 seconds to enter string number 2 / voltage setting. The LED stays lit and the string number/voltage LED flashes. - After setting, hold the button for 2 seconds to save and return to the 4 power status display, or wait 5 seconds for automatic return. - Use the button to set the battery line number or voltage. For details, please refer to the table option settings above. Practical applications - Field service: quickly configure battery type and string/voltage for a device, then verify the 4 power status indicators. - Laboratory testing: configure multiple battery strings by adjusting line numbers and voltages for performance experiments. - DIY power packs: set up compact, custom voltage configurations for portable equipment with on-device guidance.