/Battery-Voltmeter-Modules

A list of common battery level modules with product codes, images, and comparative specifications.

Primary LanguagePowerShell

Battery Voltmeter Modules

These LCD modules display the battery charge level and voltage of a variety of battery chemistries and voltages. I have compiled this list because many of these modules are inexpensive and available from many sources, but few sources name them by the manufacturer's part number, making it hard to search for and compare different products. Feel free to contact me with any corrections or additions to this list.

Many support lead-acid, lithium ion (Li-on), and lithium iron-phosphate (LiFePO4) chemistries, with cell series arrangements up to ~65V, meaning up to 4-series for lead-acid (48V nominal, 56.4V full), and 15-series for Li-ion (56V nominal, 63V full). Parallel cell arrangements only affect capacity, not voltage, so these will work with any number of parallel cells. These meters only measure voltage, and infer charge level from the current voltage. They have no sense of absolute capacity, nor rate of discharge; they can only tell you what percentage of full capacity the battery is at.

Manufacturers

Battery Voltmeter Modules

Product Code Panel Mount Buttons Battery Indicator Numeric Readout Dimensions Sleep
BW-LY4 Flush 1 front, 2 back 7 segments V/% Toggle 59x27x17mm Off after 10s, probably
BW-LY5 Flush 1 front*, 2 back 7 segments V/% Toggle? 59x38x16.5mm Configurable *
BW-LY6N Flush 1 back 5 segments % 57.5x20x16.5mm Always on
BW-LY6W Bezel 1 back 5 segments % 60x23x15mm Always on
BW-LY7 ** Bezel 1 front, 2 back 5 segments V/% Toggle 57x30x12.8mm Configurable: Always On / Off after 10s
BW-LY7S ** Bezel 1 front, 2 back 5 segments V/% Toggle 57x30x12.8mm Configurable: Always On / Off after 10s
BW-TH01 Flush 1 back 5 segments % 48x25x16mm ???
GY-6S Bezel 2 front 7 segments V/% Toggle 61.3x33.3x13.5mm
GY-6D Bezel 1 front, 1 back 7 segments V/% Toggle 61.3x33.3x13.5mm
GY-6 Flush 2 back 7 segments V/% 61.3x33.3x13.5mm

*BW-LY5 comes in two styles. Model without button, backlight is always on. Model with button, you can adjust backlight sleep function, backlight trigger, and voltage/percent display.
**BW-LY7 LCD is green-on-black, whereas BW-LY7S is black-on-green.


Lead-acid voltages based on 12 volt 6-cell batteries

12V Battery in Series Empty Nominal Full
1 10.8V 12.0V 14.1V
2 21.6V 24.0V 28.2V
3 32.4V 36.0V 42.3V
4 43.2V 48.0V 56.4V

Li-ion battery voltages based on number of cells in series

Series Empty Nominal Full
1s 3.0V 3.7V 4.2V
2s 6.0V 7.4V 8.4V
3s 9.0V 11.1V 12.6V
4s 12.0V 14.8V 16.8V
5s 15.0V 18.5V 21.0V
6s 18.0V 22.2V 25.2V
7s 21.0V 25.9V 29.4V
8s 24.0V 29.6V 33.6V
9s 27.0V 33.3V 37.8V
10s 30.0V 37.0V 42.0V
11s 33.0V 40.7V 46.2V
12s 36.0V 44.4V 50.4V
13s 39.0V 48.1V 54.6V
14s 42.0V 51.8V 58.8V
15s 45.0V 55.5V 63.0V

LiFePO4 battery voltages based on number of cells in series

Series Empty Nominal Full
1s 2.5V 3.2V 3.6V
2s 5.0V 6.4V 7.2V
3s 7.5V 9.6V 10.8V
4s 10.0V 12.8V 14.4V
5s 12.5V 16.0V 18.0V
6s 15.0V 19.2V 21.6V
7s 17.5V 22.4V 25.2V
8s 20.0V 25.6V 28.8V
9s 22.5V 28.8V 32.4V
10s 25.0V 32.0V 36.0V
11s 27.5V 35.2V 39.6V
12s 30.0V 38.4V 43.2V
13s 32.5V 41.6V 46.8V
14s 35.0V 44.8V 50.4V
15s 37.5V 48.0V 54.0V
16s 40.0V 51.2V 57.6V
17s 42.5V 54.4V 61.2V

Photos

BW-LY4

BW-LY4 BW-LY4 Dimensions BW-LY4 Panel Dimensions

BW-LY5

BW-LY5 BW-LY5 Dimensions BW-LY5 Panel Dimensions

BW-LY6N

BW-LY6N BW-LY6N Dimensions

BW-LY6W

BW-LY6W BW-LY6W Dimensions

BW-LY7

BW-LY7 BW-LY7 Dimensions BW-LY7 BW-LY7S Panel Dimensions

BW-LY7S

*BW-LY7 and BW-LY7S are identical except the LCD colours are inverted
BW-LY7S BW-LY7S Dimensions BW-LY7 BW-LY7S Panel Dimensions

BW-TH01

BW-TH01 BW-TH01 Panel Dimensions

GY-6

GY-6 GY-6 Dimensions

GY-6D

GY-6D GY-6S GY-6D Dimensions

GY-6S

GY-6S GY-6S GY-6D Dimensions