1S 18650 Li-ion / Li-Po Single-Cell Battery Capacity Indicator Module

Monitor your battery status at a glance with the 1S 18650 Li-ion / Li-Po Battery Capacity Indicator Module. Designed for single-cell lithium chemistry batteries ( $3.7 ext{V}$ nominal / $4.2 ext{V}$ fully charged), this compact display board features a bright 4-segment blue LED bargraph surrounded by a red battery outline frame. It instantly displays remaining capacity across four distinct voltage thresholds ( $25%$ , $50%$ , $75%$ , and $100%$ ). Featuring simple two-wire connection ( $+ ext{ and }-$ ), low standby power consumption, and reverse polarity protection, it is the perfect status display for DIY power banks, RC models, and portable electronic projects.

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Tags 1S Battery Capacity Indicator 1S 18650 Battery Tester Display Single Cell Lithium Fuel Gauge 3.7V LiPo Battery Indicator 1S LED Battery Power Display 18650 Battery Voltage Level Board Li-ion Battery Status Indicator

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Product Details :

The 1S 18650 Lithium Battery Capacity Indicator Module is a visual fuel gauge designed for monitoring single-cell lithium-based batteries, including 18650 cells, Li-Po pouches, and 26650 cells. Operating across the typical single-cell discharge curve ( $3.3 ext{V}$ to $4.2 ext{V}$ ), the board automatically senses battery terminal voltage and lights up a corresponding number of LED bars.

The module incorporates a red outer battery frame LED that illuminates as long as voltage remains above the minimum threshold ( $pprox 3.3 ext{V}$ ), accompanied by four blue inner progress bars that fill up as battery charge level increases. With its minimal current draw ( $pprox 5 ext{mA}$ active) and straightforward 2-wire soldering pads ( $V_+$ and $V_-$ ), it integrates cleanly into custom battery enclosures, portable power banks, electronic toys, and solar-charged IoT nodes.

Key Features and Benefits

Instant 4-Bar Visual Display: Red outline LED for power detection plus 4 blue segments indicating battery level ( $25%$ , $50%$ , $75%$ , $100%$ ).
Optimized for Single-Cell Lithium Chemistry: Calibrated specifically for $3.7 ext{V}$ nominal / $4.2 ext{V}$ peak $1 ext{S}$ Li-ion, Li-Po, and 18650 batteries.
Simple 2-Wire Installation: Connects directly across the positive ( $+$ ) and negative ( $-$ ) terminals of the battery pack.
Low Current Consumption: Draws approximately $5 ext{mA}$ during display operation to minimize idle battery drain.
Clear High-Contrast Display: Ultra-bright LEDs ensure high visibility through dark acrylic panels or plastic enclosures.

Technical Specifications

Feature Component	Specification Details
Supported Battery Type	Single Cell ( $1 ext{S}$ ) Lithium-ion / Li-Po (18650, 26650, Polymer)
Operating Voltage Range	$3.3 ext{V DC to } 4.2 ext{V DC}$
Display Color	Red Frame Border + Blue Inner Capacity Bars
Current Consumption	$pprox 5 ext{ mA}$
Operating Temperature	$-10^circ ext{C to } +65^circ ext{C}$
Reverse Polarity Protection	Yes (Prevents board damage if wired backwards)
Connection Interface	Solder Pads marked $V+$ (Red) and $V-$ (Black)

Voltage Threshold & LED Display Mapping

1. Voltage Thresholds:

Battery Voltage Level	Active LED Bar Count	Display Capacity Level
$V_{BAT} < 3.3 ext{V}$	All Bars OFF (Only Frame Off or Weak)	$< 5%$ (Battery Depleted / Requires Charge)
$3.3 ext{V} le V_{BAT} < 3.5 ext{V}$	1 Bar ON	$25%$ Capacity Remaining
$3.5 ext{V} le V_{BAT} < 3.7 ext{V}$	2 Bars ON	$50%$ Capacity Remaining
$3.7 ext{V} le V_{BAT} < 3.9 ext{V}$	3 Bars ON	$75%$ Capacity Remaining
$V_{BAT} ge 3.9 ext{V}$	4 Bars ON	$100%$ Capacity (Fully Charged)

2. Wiring Diagram:

      +-----------------------------+
      |  1S Lithium Battery (3.7V)  |
      +--------------+--------------+
                     |
           +---------+---------+
           |                   |
      (Positive)          (Negative)
        [ Red ]            [ Black ]
           |                   |
           v                   v
      +----+-------------------+----+
      |  V+                     V-  |
      |   [1S Battery Indicator]    |
      +-----------------------------+

PRO TIP FOR POWER SAVING: To prevent continuous battery drain when your device is switched off, wire the module's positive input ( $V_+$ ) through a momentary push-button switch or downstream of your main power switch. Pressing the button briefly lights up the display to check battery status without leaving the LEDs constantly powered.

Applications

DIY 18650 Power Banks & Portable Chargers: Visual power gauge for single-cell battery banks.
RC Toys & Drones: Real-time battery status monitoring for $1 ext{S}$ Li-Po powered micro drones and RC cars.
Solar-Powered Bluetooth Speakers: Monitoring internal battery charge in custom portable speakers.
Handheld Instruments & Field Gear: Compact battery capacity monitoring for custom handheld electronics and multimeters.