{"product_id":"18650-2-cell-battery-holder-for-diy-electronics-arduino-projects","title":"18650 2-Cell Battery Holder for DIY Electronics \u0026 Arduino Projects","description":"\u003ch1\u003e18650 2-Cell Battery Holder - 7.4V Series Output\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis 2-cell 18650 battery holder connects two 3.7V lithium-ion cells in series, delivering a nominal 7.4V output ideal for powering Arduino, ESP32, and Raspberry Pi projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBattery Compatibility\u003c\/td\u003e\n\u003ctd\u003e2 × 18650 (not included)\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eConfirmed\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnection Type\u003c\/td\u003e\n\u003ctd\u003eSeries (2S)\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eConfirmed\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e7.4V (8.4V fully charged)\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eTypical\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Current\u003c\/td\u003e\n\u003ctd\u003eUp to 2A (cell‑dependent)\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eEstimated\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eJST PH2.0 male plug, 15cm wire\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eTypical\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eABS plastic\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eTypical\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e~77 × 38 × 20 mm\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eEstimated\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e~20 g\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"confidence\"\u003eEstimated\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-ev-charging-station-power-monitor\"\u003e\n\u003cstrong\u003eArduino Weather Station:\u003c\/strong\u003e Power an outdoor sensor node with a 7.4V Li‑ion pack and solar charging circuit.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESP32 Wi‑Fi Repeater:\u003c\/strong\u003e Build a portable network extender running directly from the holder’s regulated 5V output.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRaspberry Pi Handheld Console:\u003c\/strong\u003e Use a step‑down converter to safely power a Pi Zero gaming handheld.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCBSE Class 12 Physics Project:\u003c\/strong\u003e Demonstrate series voltage addition with two 18650 cells in a hands‑on practical.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eB.Tech Smart‑Cart Final Year Project:\u003c\/strong\u003e Supply a mobile robot’s motor driver and microcontroller with a compact 7.4V source.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVin, GND\u003c\/td\u003e\n\u003ctd\u003eOnboard regulator accepts 7‑12V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVin, GND\u003c\/td\u003e\n\u003ctd\u003eSame as Uno\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVin, GND\u003c\/td\u003e\n\u003ctd\u003eSame as Uno\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVin, GND\u003c\/td\u003e\n\u003ctd\u003eVin accepts 5‑12V (LDO regulator)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVin, GND\u003c\/td\u003e\n\u003ctd\u003eVin accepts 5‑12V (AMS1117 reg.)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes, with buck converter\u003c\/td\u003e\n\u003ctd\u003eVSYS (5V), GND\u003c\/td\u003e\n\u003ctd\u003eStep‑down to 5V required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes, with buck converter\u003c\/td\u003e\n\u003ctd\u003e5V GPIO pin, GND\u003c\/td\u003e\n\u003ctd\u003eStable 5V supply needed\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the red wire (positive) to a board’s Vin or a regulator input, and the black wire (negative) to GND. Always insert cells with correct polarity as marked on the holder. For 3.3V or 5V systems, use a buck converter to step down the voltage to the required level.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I use two different 18650 cells in this holder?\u003c\/h3\u003e\n    \u003cp\u003eUsing mismatched cells (capacity, age, brand) is not recommended; it can cause uneven charging\/discharging and potential damage.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eWhat is the maximum current this holder can safely deliver?\u003c\/h3\u003e\n    \u003cp\u003eThe holder’s contacts can handle up to 2A continuous, but actual current depends on the installed 18650 cells.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/18650-2-cell-battery-holder-for-diy-electronics-arduino-projects#product\",\n      \"name\": \"18650 2-Cell Battery Holder - 7.4V Series Output\",\n      \"description\": \"18650 2-cell battery holder with 7.4V series output for Arduino projects. 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