{"product_id":"witty-fox-3-7v-4000mah-li-ion-battery","title":"Witty Fox 3.7V 4000mAh Li-Ion Battery","description":"\u003cmeta name=\"description\" content=\"Buy Witty Fox 37V 4000mAh LiIon Battery online in India at best price from The Engineer Store, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\u003ch1\u003eWitty Fox 3.7V 4000mAh Li-Ion Battery\u003c\/h1\u003e\n\u003cp\u003ePower your portable projects with confidence using the Witty Fox 3.7V 4000mAh Li-Ion Battery. This high-capacity rechargeable lithium-ion cell delivers reliable, long-lasting energy for IoT devices, GPS trackers, handheld instruments, robotics, and custom electronics. With built-in protection circuitry and a generous 4000mAh capacity, it's the ideal choice for applications demanding extended runtime in a compact, lightweight form factor. Available from The Engineer Store, Bengaluru, with fast shipping and full technical support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWitty Fox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Chemistry\u003c\/td\u003e\n\u003ctd\u003eLithium-Ion (Li-Ion)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e3.7V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e4000mAh (14.8Wh)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharge Voltage\u003c\/td\u003e\n\u003ctd\u003e4.2V (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge Cut-off Voltage\u003c\/td\u003e\n\u003ctd\u003e2.75V (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd\u003eBuilt-in (overcharge, over-discharge, short-circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCycle Life\u003c\/td\u003e\n\u003ctd\u003e500+ charge\/discharge cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eJST PH 2.0mm 2-pin (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Configuration\u003c\/td\u003e\n\u003ctd\u003eSingle cell (1S)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-20 degreesC to 60 degreesC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-20 degreesC to 45 degreesC (recommended at ~3.8V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApproximately 70-80g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal \/ Authentic Witty Fox Product\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7-day warranty on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eEmail \u0026amp; WhatsApp 24\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Capacity 4000mAh:\u003c\/strong\u003e Delivers extended runtime for power-hungry portable projects, reducing the frequency of recharging and enabling longer field deployments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable 3.7V Nominal Output:\u003c\/strong\u003e Provides consistent voltage throughout the discharge cycle, ensuring predictable performance for microcontrollers, sensors, and communication modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Protection Circuit Module (PCM):\u003c\/strong\u003e Safeguards against overcharging beyond 4.2V, deep discharge below safe thresholds, short circuits, and overcurrent conditions - protecting both the battery and your connected electronics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500+ Cycle Lifespan:\u003c\/strong\u003e Engineered for durability and repeated use, maintaining at least 80% of original capacity after 500 full charge-discharge cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight Design:\u003c\/strong\u003e Optimized energy density packs 4000mAh into a slim pouch or prismatic cell format, fitting easily into enclosures, handheld devices, and custom housings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature Range:\u003c\/strong\u003e Functions reliably from -20 degreesC to 60 degreesC, making it suitable for outdoor deployments, weather stations, and field instrumentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard JST Connector:\u003c\/strong\u003e Comes with a JST PH 2.0mm 2-pin connector for plug-and-play compatibility with popular development boards, charging modules, and battery management systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrusted Witty Fox Quality:\u003c\/strong\u003e A well-regarded brand in the Indian maker and electronics community, known for consistent cell quality and accurate capacity ratings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose the Witty Fox 4000mAh Battery?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Authentic:\u003c\/strong\u003e Sourced directly from Witty Fox through authorized distribution channels. Every battery is verified for genuine capacity and quality - no relabeled or counterfeit cells.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue Rated Capacity:\u003c\/strong\u003e Unlike many budget Li-Ion cells on the market that overstate their mAh ratings, Witty Fox batteries deliver honest, tested capacity you can rely on for your designs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety First:\u003c\/strong\u003e The onboard protection circuit eliminates common lithium battery hazards, giving you peace of mind during prototyping, testing, and final deployment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaker-Friendly:\u003c\/strong\u003e Designed with hobbyists, students, and engineers in mind - the standard connector and well-documented specs make integration straightforward.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Shipping from Bengaluru:\u003c\/strong\u003e Ships from The Engineer Store warehouse in Bengaluru. 1-5 day shipping, 7-8 day delivery across most of India; same-day delivery available within Bengaluru.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpert Technical Support:\u003c\/strong\u003e Our team can help you select the right charging IC, design battery management circuits, and troubleshoot power-related issues in your projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Charging Solutions\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTP4056 Module:\u003c\/strong\u003e The most popular single-cell Li-Ion charger module. Use the 1A version for safe charging (full charge in approximately 4-5 hours). Micro-USB or USB-C input variants available.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMCP73831 Based Chargers:\u003c\/strong\u003e Compact IC-based charging solutions ideal for PCB-integrated designs with adjustable charge current.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar Charging Boards:\u003c\/strong\u003e Pair with solar panels (5V-6V) and a solar charge controller for off-grid and remote sensing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eProducts ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs technical support available?\u003c\/summary\u003e\n\u003cp\u003eYes, 24\/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return policy?\u003c\/summary\u003e\n\u003cp\u003e7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eBuy Witty Fox 3.7V 4000mAh Li-Ion Battery Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eWitty Fox 3.7V 4000mAh Li-Ion Battery\u003c\/strong\u003e online at \u003ca href=\"https:\/\/theengineerstore.in\"\u003eThe Engineer Store\u003c\/a\u003e - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003eWitty Fox 3.7V 4000mAh Li-Ion Battery\u003c\/strong\u003e with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.\u003c\/p\u003e\n\u003cp\u003eLooking to buy \u003cstrong\u003eWitty Fox 3.7V 4000mAh Li-Ion Battery\u003c\/strong\u003e at the best price in India? The Engineer Store offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":43773750247587,"sku":"TES-EV102534","price":291.73,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/4479\/7091\/products\/4000mah3.7v_0c2565ad-fe6f-40bb-a381-117538573e7c_1024x1024_2x-removebg-preview.png?v=1701074274","url":"https:\/\/www.theengineerstore.in\/zh-hant\/products\/witty-fox-3-7v-4000mah-li-ion-battery","provider":"The Engineer Store","version":"1.0","type":"link"}