DC 7–100V Battery Monitor: Know exactly how much power you have left
Never get caught out mid-journey again. With a 7–100V DC battery monitor mounted on your handlebars, you get a precise, real-time percentage display of your remaining battery life. No more guesswork, no more unpleasant surprises. This versatile unit is compatible with Li-ion, LiFePO4, and Lead-acid batteries ranging from 12V to 84V, making it the perfect upgrade for any e-bike, electric scooter, or mobility vehicle.
Note: The displayed percentage is calculated based on measured voltage and your custom settings (battery type, minimum, and maximum voltage). For optimal accuracy, please select the correct battery chemistry and verify your Lo-V and Hi-V thresholds before first use.
Why choose this monitor? (Key Advantages):
- Universal Compatibility — Works with Li-ion, LiFePO4, and Lead-acid batteries between 7V and 100V, covering almost all popular e-bike and scooter configurations without needing extra adapters.
- Three-in-One Display — Quickly toggle between voltage, battery percentage, and temperature directly on the main screen with a single press.
- Automatic Low-Voltage Alert — The battery icon flashes clearly when your charge drops below 10%, giving you plenty of time to find a charging point.
- Non-Volatile Memory — Your settings, including battery type, Lo-V, Hi-V, and backlight preferences, are saved automatically, so you never have to reconfigure after a power-off.
- Ultra-Low Power Consumption — Consuming only ~15 mA, it has a negligible impact on your vehicle’s overall range.
- Adjustable Backlight — Choose how long the screen stays lit (10 to 90 seconds) or set it to remain on permanently.
- Custom Mode — If you have a non-standard battery pack, you can manually set the minimum and maximum voltage to calibrate the indicator to your specific chemistry.
Performance and Features
The wide-angle colour LCD screen displays both voltage and percentage simultaneously, ensuring excellent visibility from any angle. The percentage calculation is based on the actual discharge curves of your specific battery type—not a simplified linear estimate—providing a true reflection of remaining energy. A quick double-click activates low-power mode for extended periods of inactivity, and all your settings are retained for the next time you power up.
| Parameter | Value / Detail |
|---|---|
| Measurement Range | DC 7–100V |
| Supported Battery Types | Li-ion, LiFePO4, Lead-acid |
| Nominal Voltages | 12V, 24V, 36V, 48V, 52V, 60V, 72V, 84V |
| Display | Wide-angle colour LCD |
| Display Modes | Voltage / Battery Percentage / Temperature |
| Current Consumption | ~15 mA |
| Li-ion Presets | L03 – L20 |
| LiFePO4 Presets | F03 – F24 |
| Lead-acid Presets | P12, P24, P36, P48, P60, P72, P84 |
| Minimum Voltage (Lo-V) | Manually adjustable |
| Maximum Voltage (Hi-V) | Manually adjustable |
| Backlight | B-0 (Permanent) – B-9 (10–90s timeout) |
| Low-Voltage Alert | Flashing battery icon below 10% |
| Memory | Yes — settings retained after power-off |
| Applications | E-bikes, scooters, electric vehicles, solar systems, industrial |
Programming and Usage Instructions
- Li-ion Selection: Long press (2s) on the main screen → short press to navigate to the desired mode (L03–L20; e.g., 48V → L13) → long press (2s) to confirm → auto-return to main screen.
- LiFePO4 Selection: Long press (2s) → short press to select cell count (F03–F24; e.g., 48V → F15) → long press (2s) to confirm → auto-return to main screen.
- Lead-acid Selection: Long press (2s) → short press to select nominal voltage (P12–P84) → long press (2s) to confirm → auto-return to main screen.
- Set Minimum Voltage (Lo-V): Long press (2s) → navigate to Lo-V → short press to adjust value → long press (2s) to confirm.
- Set Maximum Voltage (Hi-V): Long press (2s) → navigate to Hi-V → short press to adjust value → long press (2s) to confirm.
- Toggle Percentage Display: Long press (2s) → select ON-% or OF-% → long press (2s) to confirm.
- Configure Backlight: Long press (2s) → short press to select B-0 (permanent) or B-1 to B-9 (10–90s timeout) → long press (2s) to confirm.
- Switch Display Mode: Short press on the main screen to cycle through voltage, percentage, and temperature.
- Low-Power Mode: Double-click quickly to toggle between normal display and low-power standby mode.
Package Contents
- 1 × Digital DC 7–100V Battery Monitor/Voltmeter
- 1 × Connection cable
- Mounting screws and gasket set
Frequently Asked Questions
Is this compatible with my 48V e-bike battery?
Yes. For a 48V Li-ion battery, select L13; for 48V LiFePO4, select F15. The percentage will automatically calculate based on the discharge curve for that specific chemistry.
What happens when the battery is nearly empty?
When the charge drops below 10%, the battery icon on the display will begin to flash, providing a clear visual warning before you run out of power.
Will I lose my settings if I disconnect the device?
No. The device features non-volatile memory that stores all your configurations—battery type, Lo-V, Hi-V, backlight, and display preferences—even if it is disconnected for an extended period.
Can I use this for solar systems or marine applications?
Yes. The 7–100V DC range and support for major battery chemistries make this unit suitable for marine use, off-grid solar systems, and various industrial battery installations.
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