5-Pack Lithium Battery Indicator 1S 2S 3S LED Voltage Display
5-Pack Lithium Battery Indicator 1S 2S 3S LED Voltage Display
LOTHYE 5-Pack Lithium Battery Capacity Indicator Module – 1S / 2S / 3S | 3.7V–12.6V with Undervoltage Warning
Never get caught off guard by a dead battery again. The LOTHYE Lithium Battery Capacity Indicator (pack of 5) gives you an instant, at-a-glance power level reading for 1S, 2S, and 3S lithium battery packs (3.7V–12.6V). With 5 bright LED indicators and a built-in undervoltage warning, this ultra-compact module is the perfect addition to RC vehicles, drones, DIY power banks, e-bikes, and any lithium-powered project.
Made in Mainland China.
Key Features
- 5 LED Power Level Display – Intuitive, easy-to-read bar graph shows real-time charge level at a glance.
- Wide Compatibility – Supports 1S (3.7V), 2S (7.4V), and 3S (11.1V/12.6V) lithium battery packs.
- Undervoltage Warning – Alerts you when the battery voltage drops to a critical level, helping protect battery life and performance.
- Ultra-Thin & Compact Design – Square size: 22mm × 22mm | Circular size: 21.7mm diameter — fits neatly into any build.
- Zero Standby Drain – Press the red button to activate; LEDs automatically switch off after 3–5 seconds, consuming no power at rest.
- Reverse Connection Protection – Built-in safeguard prevents damage if positive/negative terminals are accidentally swapped.
- Pack of 5 – Great value for hobbyists, makers, and professionals needing multiple units.
LED Voltage Reference Chart
Note: N = number of battery cells. Values are reference figures with ±2% tolerance.
| LEDs Lit | Voltage Threshold | Approx. Charge Level |
|---|---|---|
| 1 bar | > N × 3.3V | Very Low |
| 2 bars | > N × 3.6V | Low |
| 3 bars | > N × 3.8V | Mid |
| 4 bars | > N × 4.0V | High |
| 5 bars | Fully charged | Full |
How to Use
- Connect the indicator's positive and negative terminals to the corresponding terminals of your lithium battery.
- Press the red button — the LED bar graph illuminates and shows the real-time battery charge level.
- Release the button; the LEDs turn off automatically after 3–5 seconds to conserve power.
- If the terminals are accidentally reversed, the reverse-connection protection prevents module damage — simply adjust and reconnect.
Specifications
- Brand: LOTHYE
- Compatibility: 1S / 2S / 3S Lithium Batteries (3.7V – 12.6V)
- Indicator: 5-LED bar display
- Square Size: 22mm × 22mm
- Circular Size: Ø 21.7mm
- Standby Current: 0mA (auto off)
- Condition: New
- Quantity: 5 pieces per pack
- Origin: Made in Mainland China
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Frequently Asked Questions
Q: What lithium battery configurations are compatible with this indicator module?
A: This lithium battery capacity indicator supports 1S (3.7V), 2S (7.4V), and 3S (11.1V up to 12.6V) lithium battery packs. It covers a wide input range of 3.7V to 12.6V, making it suitable for RC vehicles, drones, DIY power banks, and e-bike battery packs.
Q: Does the indicator drain the battery when not in use?
A: No. The display is activated only when you press the red button. After you release the button, the LEDs automatically switch off within 3–5 seconds, resulting in zero standby current draw and no passive battery drain.
Q: What happens if I accidentally connect the terminals in reverse?
A: The module features built-in reverse-connection protection. If the positive and negative leads are swapped, the circuitry prevents damage to the indicator. Simply disconnect, re-orient the leads correctly, and reconnect.
Q: How accurate is the battery level reading?
A: The LED voltage thresholds are reference values with a tolerance of approximately ±2%. For most hobbyist and DIY applications this provides reliable, actionable charge-level information. If precision voltage measurement is required, a dedicated digital voltmeter is recommended alongside this module.