{"product_id":"li-ion-battery-capacity-gauge-1s-8s-3-7v-lithium-tester","title":"Li-ion Battery Capacity Gauge | 1S–8S 3.7V Lithium Tester","description":"\n\u003ch2\u003eLi-ion Battery Capacity Gauge – 1S to 8S Lithium Power Display Module\u003c\/h2\u003e\n\u003cp\u003eKeep your lithium battery packs operating at peak efficiency with this compact, easy-to-read \u003cstrong\u003eLi-ion Battery Capacity Gauge\u003c\/strong\u003e. Designed for 3.7V single-cell and multi-cell packs (1S through 8S), this nixie-tube display module gives you an instant, real-time readout of remaining charge — so you always know when it's time to plug in and never risk damaging your equipment from over-discharge.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're managing battery packs for RC vehicles, e-bikes, DIY power walls, drones, or portable electronics, this versatile tester handles lithium-ion, lithium lead-acid, and nickel-hydrogen chemistries within its 3–34 V operating range.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide voltage range:\u003c\/strong\u003e Operates from 3 V to 34 V, supporting 1S–8S lithium battery configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple pad-select setup:\u003c\/strong\u003e Solder-bridge the matching S1–S8 pad to configure for your exact battery string in seconds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-segment LED display:\u003c\/strong\u003e Lights up 1–4 blocks based on real-time voltage; all segments off signals it's time to charge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-precision reading:\u003c\/strong\u003e ±2% voltage accuracy at only 5 mA working current — minimal drain on your pack\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad temperature tolerance:\u003c\/strong\u003e Operates reliably from –20 °C to +50 °C (–4 °F to 122 °F)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; portable:\u003c\/strong\u003e Slim form factor makes it easy to embed into battery enclosures or carry in the field\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal chemistry compatibility:\u003c\/strong\u003e Works with Li-ion, LiPo, lead-acid, and NiMH packs within the voltage range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eConnect the positive and negative leads of the display board directly to the corresponding terminals of your battery pack. The nixie tube instantly displays the charge level:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVoltage \u0026gt; N × 3.9 V → \u003cstrong\u003e4 bars\u003c\/strong\u003e (full)\u003c\/li\u003e\n  \u003cli\u003eVoltage \u0026gt; N × 3.7 V → \u003cstrong\u003e3 bars\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003eVoltage \u0026gt; N × 3.5 V → \u003cstrong\u003e2 bars\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003eVoltage \u0026gt; N × 3.3 V → \u003cstrong\u003e1 bar\u003c\/strong\u003e\n\u003c\/li\u003e\n  \u003cli\u003eVoltage \u0026lt; N × 3.3 V → \u003cstrong\u003e0 bars\u003c\/strong\u003e — charge immediately\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eN = number of cells in series (e.g., 3S = 3 cells). Maximum input voltage must not exceed N × 4.3 V.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 V – 34 V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e±2%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1S – 8S (pad selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e–20 °C to +50 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × Battery Capacity Display Module\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 China (Mainland)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot waterproof\u003c\/strong\u003e — if used outdoors, protect from moisture. Electronic components require a dry environment.\u003c\/li\u003e\n  \u003cli\u003eOnly one S1–S8 solder pad may be bridged at a time; shorting two or more simultaneously will damage the module.\u003c\/li\u003e\n  \u003cli\u003eDo not exceed the maximum voltage of N × 4.3 V for your selected cell count.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-300mm-adjustable-pcb-holder-360-rotation-soldering-stand-clamp\"\u003e0–300mm PCB Holder Stand | 360° Rotation Soldering Clamp\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on lithium battery safety standards and best practices, visit the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/MagSafe_%28wireless_charger%29\" target=\"_blank\" rel=\"noopener\"\u003eMagSafe (wireless charger)\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery types are compatible with this Li-ion capacity gauge?\u003c\/h4\u003e\n\u003cp\u003eA: This battery capacity gauge is compatible with lithium-ion (Li-ion), LiPo, lead-acid, and nickel-hydrogen (NiMH) battery packs, as long as the total pack voltage falls within the 3 V to 34 V operating range. It is most commonly used with 3.7 V lithium cells in 1S through 8S configurations.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I select the correct cell count (1S–8S) on the module?\u003c\/h4\u003e\n\u003cp\u003eA: The module includes labeled solder pads marked S1 through S8. Simply apply a small solder bridge to the pad that matches your battery string count (e.g., S3 for a 3S pack). Only bridge one pad at a time — bridging two or more simultaneously can damage the module.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does it mean when all four display segments are off?\u003c\/h4\u003e\n\u003cp\u003eA: When all four LED bars go dark, it indicates the battery voltage has dropped below N × 3.3 V (where N is your cell count). This is the module's low-charge alert — you should recharge your battery pack promptly to avoid deep discharge damage.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this tester outdoors or in wet conditions?\u003c\/h4\u003e\n\u003cp\u003eA: This module is not waterproof. If you plan to use it in outdoor environments, you should enclose it in a waterproof housing or apply a conformal coating to protect the electronic components from moisture and humidity.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery types are compatible with this Li-ion capacity gauge?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This battery capacity gauge is compatible with lithium-ion (Li-ion), LiPo, lead-acid, and nickel-hydrogen (NiMH) battery packs, as long as the total pack voltage falls within the 3 V to 34 V operating range. 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If you plan to use it in outdoor environments, you should enclose it in a waterproof housing or apply a conformal coating to protect the electronic components from moisture and humidity.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Li-ion Battery Capacity Gauge | 1S–8S 3.7V Lithium Tester\", \"item\": \"https:\/\/oasis-select.com\/products\/li-ion-battery-capacity-gauge-1s-8s-3-7v-lithium-tester\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"Blue","offer_id":47755301585001,"sku":"14:175#Blue","price":3.04,"currency_code":"USD","in_stock":true},{"title":"Green","offer_id":47755301617769,"sku":"14:366#Green","price":3.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S721f8e8372ed48a690a38ac0f51ccd7ci.webp?v=1783268154","url":"https:\/\/oasis-select.com\/products\/li-ion-battery-capacity-gauge-1s-8s-3-7v-lithium-tester","provider":"Oasis Select","version":"1.0","type":"link"}