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The 1S–8S LiPo Voltage Checker & Low Voltage Buzzer Alarm is an indispensable safety tool for anyone working with multi-cell Lithium Polymer (LiPo), Lithium Iron Phosphate (LiFePO4​), Lithium-ion ($\text{Li-ion}$), or Lithium-Manganese ($\text{LiMn}$) battery packs. Discharging a LiPo cell below $3.0\text{V}$ can cause permanent chemical damage, reduced flight times, swelling (puffing), or total battery failure. This module plugs directly into the standard JST-XH balance lead of your battery pack to provide instant visual and acoustic battery health diagnostics.

The unit automatically cycles through total pack voltage followed by individual cell voltages (Cell 1, Cell 2, up to Cell 8) on a bright red 3-digit LED display. An integrated push-button allows users to adjust the low-voltage alarm setpoint between $2.7\text{V}$ and $3.8\text{V}$ per cell in $0.1\text{V}$ increments (or turn the alarm off completely). When any individual cell's voltage dips below the configured threshold, two high-decibel onboard piezo buzzers sound an ultra-loud alarm along with a flashing red indicator LED, alerting the operator to land their drone or power down their equipment safely.

Key Features and Benefits

• Universal Multi-Cell Support: Compatible with 1S up to 8S LiPo, LiFe, Li-ion, and LiMn rechargeable battery packs.

• Dual Loud Piezo Buzzers: Twin high-decibel buzzers ($>100\text{dB}$) cut through high motor/propeller noise to provide immediate low-battery alerts in the field.

• Customizable Alarm Threshold: Push-button setpoint selection from $2.7\text{V}$ to $3.8\text{V}$ per cell (Default: $3.3\text{V}$ per cell) with non-volatile memory that saves your preferences.

• Plug-and-Play Balance Connector: Standard 2.54mm pin spacing connects directly to JST-XH balance plugs found on nearly all 2S–8S RC battery packs.

• High Measurement Precision: Microcontroller-driven voltage sensing accuracy within $\pm 0.01\text{V}$ per cell.

• Ultra-Compact & Lightweight: At just 9 grams, it can be permanently mounted on RC planes, quadcopters, and rock crawlers without affecting center of gravity.

Technical Specifications

Operation & Pinout Guide

1. Connecting to Battery Balance Plug:

• Align the black ground pin ($GND$ / $-$) of the checker with the ground wire (usually black) on your battery’s JST-XH balance connector.

• Insert the balance plug across the header pins starting from the $GND$ side.

  • 2S Battery: Occupies $GND$, $1$, $2$

  • 3S Battery: Occupies $GND$, $1$, $2$, $3$

  • 4S Battery: Occupies $GND$, $1$, $2$, $3$, $4$ (up to 8S)

2. Display Cycle Sequence:

1. $ALL$: Shows total pack voltage (e.g., $12.6\text{V}$ for a fully charged 3S LiPo).

2. $1.01$ / $No.1$: Shows individual cell #1 voltage.

3. $2.02$ / $No.2$: Shows individual cell #2 voltage, continuing sequentially up to the highest cell.

3. Setting the Low-Voltage Alarm Trigger:

• Press the small push-button located between the two buzzers.

• Each press increments the alarm threshold voltage: $3.0\text{V}\to 3.1\text{V}\to 3.2\text{V}\cdots \to 3.8\text{V}\to \text{OFF}\to 2.7\text{V}$.

• Stop pressing on your desired voltage (e.g., $3.3\text{V}$ or $3.5\text{V}$). The module saves this setting automatically.

USAGE SAFETY ADVISORY: Always connect the ground wire (black lead) of the balance cable to the pin labeled "-" or "GND" on the tester. Reversing the pin orientation will prevent the module from turning on. For 1S batteries (no balance lead), insert the main discharge connector into the $1S$ / $GND$ pins.

Applications

• FPV Drones & Quadcopters: Onboard real-time low-battery monitoring to avoid crash landings caused by sudden power loss.

• RC Planes, Helicopters & Boats: Acoustic warning during flight or water runs to prevent over-discharging expensive LiPo packs.

• DIY Electric Vehicles & Robotics: Rapid battery capacity and cell-balance checking for 12V/24V robot battery banks.

• Portable Battery Pack Diagnostics: Bench testing individual cell health and detecting un-balanced or degraded cells.

Package Includes

• 1 x 1S–8S LiPo Voltage Checker & Low Voltage Buzzer Alarm Module

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components