Indicator with CANbus or RS485/Bluetooth is the solution to solve LiFePO4 battery charge state display. Dedicated design for dedicated customer after customer provide CAN protocol on CAN ID, baud rate, message structure.

Display content:
Battery’s remaining power volume LED bar with four colors (blue, green, yellow, red)
Battery’s voltage (V)
Battery’s charging percentage (%)
Hours count (H)

Specification:
Display: 10 LED Bar (1 blue,4 green.3 yellow.2 red LEDs) + 3 digital number
Operating voltage: 20-100V
Operating current: Lower than 20mA
Working temperature: -20̊C to 80C
Dimension: housing case 60mm, cutout 50-52mm, U clamp:62x25x10mm

https://www.texim-europe.com/product/battery-and-power-supplies/batteries/battery-charger/detail/asb_fsrd-can