Display Electricity Quantity Parameter:
When battery voltage is over N*3.3V,it will illuminate 1 block electricity quantity (note:N represents battery quantity)
When battery voltage is over N*3.5V,it will illuminate 2 blocks electricity quantity
When battery voltage is over N*3.7V,it will illuminate 3 blocks electricity quantity
When battery voltage is over N*3.9V,it will illuminate 4 blocks electricity quantity
When battery voltage is less than N*3.3V,4 blocks display will be off;it represents battery is less than 3.3V,and you can charge the battery

Battery description:
4V lead acid voltage range:
Battery voltage＞3.3V, bright 1 grid
Battery voltage＞3.5V, bright 2 grid
Battery voltage＞3.7V, bright 3 grid
Battery voltage＞3.9V, bright 4 grid
6V lead-acid voltage: (you can use 2 strings of lithium iron phosphate battery)
Battery voltage＞5.6V, bright 1 grid
Battery voltage＞5.9V, bright 2 grid
Battery voltage＞6.2V, bright 3 grid
Battery voltage＞6.6V, bright 4 grid
12V lead acid voltage range: (4 series of lithium iron phosphate batteries can be used)
Battery voltage＞11.0V, bright 1 grid
Battery voltage＞11.8V, bright 2 grid
Battery voltage＞12.3V, bright 3 grid
Battery voltage＞13.1V, bright 4 grid
24V lead-acid voltage range: (8-series lithium iron phosphate battery can be used)
Battery voltage＞22.3V, bright 1 grid
Battery voltage＞23.5V, bright 2 grid
Battery voltage＞24.7V,bright 3 grid
Battery voltage＞26.3V, bright 4 grid
Package Includes: 2Pcs