How do I set the battery type on my Renogy Rover 40A?
To program the battery type, hover over the Battery Voltage screen and press down the Enter button. When the battery type starts to flash, use the Select button to cycle through the options (SLD, FLD, GEL, Li) and press Enter to finalize selection. Note that when selecting the Lithium setting, you can change the battery voltage from 12V to 24V (Page 20).
From the official Renogy Rover 40a manual, page 20
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