This little panel-mount Battery Gauge is incredible smart: It shows the charging level of any lead-acid battery 12V, 24V, 36V or 48V, and it can also show the charging level of lithium battery packs between 2 and 15 cells!
Pressing and holding the button on the back side of the PCB when the module is powered up enters the setup mode, where you can select what kind of battery you have:
P1 = 12V lead acid
P2 = 24V lead acid
P3 = 36V lead acid
P4 = 48V lead acid
C2…C15 = 2-15 cell lithium battery (3.7V per cell)
The backlight comes off for just some seconds after connecting to the power supply, to avoid draining the battery.
Dimension module: 23 x 60mm
Dimension cutout: 21 x 51mm
The power connector with short open wire ends, and screws for mounting are included.