{"product_id":"li-ion-lipo-battery-level-indicator-tester-1s-7s-3-7v-29-4v","title":"Li-ion LiPo Battery Level Indicator Tester 1S–7S 3.7V–29.4V","description":"\u003ch2\u003eLi-ion \u0026amp; LiPo Battery Level Indicator Tester – 1S to 7S (3.7V–29.4V)\u003c\/h2\u003e\n\u003cp\u003eKeep tabs on your battery charge at a glance with this compact 5-LED Battery Level Indicator Tester. Compatible with 1S through 7S lithium-ion, LiPo, lithium iron phosphate, lead-acid, and electric vehicle battery packs ranging from 3.7V to 29.4V, this slim module delivers an instant, intuitive readout of real-time charge status. At just 8 g and 40 × 15 × 2.5 mm, it fits easily into any build or battery enclosure.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Compatibility:\u003c\/strong\u003e Supports 1S (3.7V) through 7S (29.4V) lithium-based battery packs — including 18650, LiPo, Li-ion, LiFePO4, lead-acid, and e-bike batteries.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5-LED Display:\u003c\/strong\u003e Ultra-thin design with four-stage power indication (25% \/ 50% \/ 75% \/ 100%) for a clear, intuitive charge level readout.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReverse Polarity Protection:\u003c\/strong\u003e Built-in reverse connection protection — if positive and negative leads are swapped, the module will not be damaged.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Standby Consumption:\u003c\/strong\u003e LED lights automatically turn off 3–10 seconds after button release; draws zero power when idle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple Push-Button Operation:\u003c\/strong\u003e Press the red button to activate the display; release to return to standby.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAllowable Error:\u003c\/strong\u003e ±2% — ideal for general monitoring and field use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable High-Quality Build:\u003c\/strong\u003e Made in Mainland China using quality materials for long-lasting performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Voltages\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1S 3.7V, 2S 7.4V, 3S 11.1V, 4S 14.8V, 5S 18.5V, 6S 22.2V, 7S 25.9V (fully charged up to 29.4V)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAllowable Error\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±2%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 mA (active)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLead Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40 × 15 × 2.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNet Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-10°C to 65°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LEDs (1 red power indicator + 4 blue\/green battery level indicators)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eLED Indicator Logic\u003c\/h3\u003e\n\u003cp\u003eThe first (red) LED acts as the power\/on indicator. The remaining four LEDs illuminate progressively based on measured voltage per cell (N = number of cells in series):\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e2nd LED ON: Battery voltage \u0026gt; N × 3.3V\u003c\/li\u003e\n  \u003cli\u003e3rd LED ON: Battery voltage \u0026gt; N × 3.5V\u003c\/li\u003e\n  \u003cli\u003e4th LED ON: Battery voltage \u0026gt; N × 3.7V\u003c\/li\u003e\n  \u003cli\u003e5th LED ON: Battery voltage \u0026gt; N × 3.9V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: 3.7V single-cell packs use 1 red + 4 green LEDs; all other voltage ranges use 1 red + 4 blue LEDs.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eHow to Use\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eConnect the positive and negative leads of the module to the corresponding terminals on your battery.\u003c\/li\u003e\n  \u003cli\u003ePress the red button — the LED indicators will light up showing the current charge level.\u003c\/li\u003e\n  \u003cli\u003eRelease the button; the LEDs will turn off automatically after a 3–10 second delay.\u003c\/li\u003e\n  \u003cli\u003eIf polarity is reversed, simply swap the leads — no damage will occur.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which battery types is this Li-ion battery level indicator tester compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This battery level indicator tester is compatible with a wide range of battery chemistries including lithium-ion (Li-ion), LiPo, lithium iron phosphate (LiFePO4), lead-acid, and electric vehicle battery packs. It supports 1S through 7S cell configurations covering voltages from 3.7V up to 29.4V fully charged.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the battery tester draw power from the battery when not in use?\u003c\/h4\u003e\n\u003cp\u003eA: No. The module features an ultra-low standby design — the LEDs automatically switch off 3 to 10 seconds after you release the button, and the tester draws zero current when idle, preserving your battery's charge.\u003c\/p\u003e\n\u003ch4\u003eQ: What happens if I accidentally reverse the positive and negative connections?\u003c\/h4\u003e\n\u003cp\u003eA: This battery indicator module includes built-in reverse polarity protection. If you accidentally connect the leads the wrong way, the module will not be damaged. Simply disconnect and reconnect with the correct polarity.\u003c\/p\u003e\n\u003ch4\u003eQ: How accurate is the battery level reading?\u003c\/h4\u003e\n\u003cp\u003eA: The tester has an allowable error of ±2%, making it well-suited for general battery monitoring and field use. If your application requires very high measurement accuracy, a precision digital voltmeter may be more appropriate.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which battery types is this Li-ion battery level indicator tester compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This battery level indicator tester is compatible with a wide range of battery chemistries including lithium-ion (Li-ion), LiPo, lithium iron phosphate (LiFePO4), lead-acid, and electric vehicle battery packs. 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