Review on 🔋 Battery Voltage Display 12V 24V 36V 48V 60V 72V, Battery Capacity Tester Indicator Panel Meter - LCD Digital Power Switch Meter for Car, RV, and Battery Systems by Dave Sapp

This is a good backlit voltage indicator that's easy to see and doesn't draw too much current from the battery being monitored. The voltage readings seem pretty accurate so I haven't messed with the potentiometer. The percentage just seems to be a calculated value made up of programmed low and high voltage values as it doesn't control the current so the percentage is kinda useless for SLA but might work fine for lithium. The product looks like it will snap into a battery hole. It cannot be easily attached to the wall because the plastic back panel design resists the silicone sticky pads and keeps falling off the wall for me. The device is highly customizable, you either choose their presets or set your own values, not both. . When you use a preset, the high and low values are set to 0, which may make you want to edit them, but editing removes the preset. All in all, this is a good and affordable option if you want a backlit voltage monitor that won't tax your system, but be careful with percentages.