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.
- Shanghai Baiway Electronic Co. - Wholesale site on Alibaba
- GuYu - Haven't found a direct manufacturer website
| 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.
| 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 |
| 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 |
| 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 |
*BW-LY7 and BW-LY7S are identical except the LCD colours are inverted
