{"product_id":"j5019-hw-357-18650-li-ion-battery-charger-dc-dc-boost-module","title":"J5019 HW-357 18650 Li-ion Battery Charger \u0026 DC-DC Boost Module","description":"\n\u003ch2\u003eJ5019 HW-357 Li-ion Battery Charger \u0026amp; DC-DC Boost Converter Module\u003c\/h2\u003e\n\n\u003cp\u003eBuy the \u003cstrong\u003eJ5019 HW-357 Lithium Battery Charger and DC-DC Boost Converter Module\u003c\/strong\u003e online in Pakistan from \u003cstrong\u003eRobostan.pk\u003c\/strong\u003e. This compact 2-in-1 power management module combines single-cell lithium-ion battery charging with adjustable step-up voltage conversion for portable electronic devices, 18650 battery projects, robotics, and DIY power supply applications.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eJ5019 HW-357\u003c\/strong\u003e supports charging compatible 3.7V nominal lithium-ion batteries using a Micro USB power input while providing an adjustable boosted DC output for powering compatible electronic loads.\u003c\/p\u003e\n\n\u003cp\u003eWith a commonly specified \u003cstrong\u003e4.5V to 8V DC input range, 4.2V battery charging voltage, and adjustable 4.3V to 27V DC boost output\u003c\/strong\u003e, this board is a convenient solution for low-power rechargeable electronic projects.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eJ5019 HW-357 2-in-1 charger and boost converter\u003c\/li\u003e\n\u003cli\u003eSingle-cell lithium-ion battery charging\u003c\/li\u003e\n\u003cli\u003eCompatible with suitable 3.7V 18650 and LiPo cells\u003c\/li\u003e\n\u003cli\u003eMicro USB charging input connector\u003c\/li\u003e\n\u003cli\u003eAdjustable DC-DC step-up voltage output\u003c\/li\u003e\n\u003cli\u003eOutput adjustable from approximately 4.3V to 27V\u003c\/li\u003e\n\u003cli\u003eCommonly specified 4.5V to 8V DC input range\u003c\/li\u003e\n\u003cli\u003e4.2V nominal lithium battery charging voltage\u003c\/li\u003e\n\u003cli\u003eCharging current up to approximately 1A\u003c\/li\u003e\n\u003cli\u003eMaximum advertised discharge current up to 2A, subject to operating conditions\u003c\/li\u003e\n\u003cli\u003eOnboard output voltage adjustment potentiometer\u003c\/li\u003e\n\u003cli\u003eCompact PCB design for portable projects\u003c\/li\u003e\n\u003cli\u003eSuitable for battery-powered electronics\u003c\/li\u003e\n\u003cli\u003eUseful for Arduino, IoT, and robotics power projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e J5019 HW-357 Charger Boost Module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e J5019 \/ HW-357\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e Li-ion Charger and DC-DC Step-Up Converter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Configuration:\u003c\/strong\u003e 1S Single Cell\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupported Battery:\u003c\/strong\u003e Compatible 3.7V Li-ion \/ LiPo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Battery Charge Voltage:\u003c\/strong\u003e 4.2V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 4.5V to 8V DC, module-dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended USB Input:\u003c\/strong\u003e Regulated 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e Approximately 4.3V to 27V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Adjustment:\u003c\/strong\u003e Onboard Potentiometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Charging Current:\u003c\/strong\u003e Approximately 1A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvertised Maximum Discharge Current:\u003c\/strong\u003e 2A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Connector:\u003c\/strong\u003e Micro USB\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Conversion:\u003c\/strong\u003e DC-DC Boost \/ Step-Up\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproximate PCB Dimensions:\u003c\/strong\u003e 33 x 23mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e PCB Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e18650 lithium battery charging projects\u003c\/li\u003e\n\u003cli\u003eDIY rechargeable power supplies\u003c\/li\u003e\n\u003cli\u003ePortable electronics development\u003c\/li\u003e\n\u003cli\u003eBattery-powered Arduino projects\u003c\/li\u003e\n\u003cli\u003eESP32 and IoT power supply projects\u003c\/li\u003e\n\u003cli\u003eSmall 5V and 9V electronic devices\u003c\/li\u003e\n\u003cli\u003ePortable measuring instruments\u003c\/li\u003e\n\u003cli\u003eRechargeable LED lighting projects\u003c\/li\u003e\n\u003cli\u003eDIY power bank experiments\u003c\/li\u003e\n\u003cli\u003eBattery backup circuit prototypes\u003c\/li\u003e\n\u003cli\u003eRobotics and automation systems\u003c\/li\u003e\n\u003cli\u003eEducational electronics projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIntegrated Lithium Battery Charging\u003c\/h3\u003e\n\n\u003cp\u003eThe J5019 HW-357 features an onboard charging circuit designed for compatible single-cell lithium-ion batteries.\u003c\/p\u003e\n\n\u003cp\u003eA suitable regulated 5V supply can be connected through its Micro USB port to recharge a connected battery using the module's charging circuitry.\u003c\/p\u003e\n\n\u003cp\u003eThe charging current depends on the board configuration, power source, battery condition, and thermal limits.\u003c\/p\u003e\n\n\u003ch3\u003eAdjustable DC-DC Boost Converter\u003c\/h3\u003e\n\n\u003cp\u003eThe module includes a step-up converter that allows a single-cell lithium battery to power electronic devices requiring a higher DC voltage.\u003c\/p\u003e\n\n\u003cp\u003eThe output voltage can be adjusted using the onboard potentiometer. Common project voltages include 5V, 9V, and 12V, provided the load requirement remains within the converter's practical operating limits.\u003c\/p\u003e\n\n\u003cp\u003eAs output voltage increases, the available output current generally decreases. High-voltage settings should only be used with appropriately low-power loads.\u003c\/p\u003e\n\n\u003ch3\u003e18650 Battery Compatibility\u003c\/h3\u003e\n\n\u003cp\u003eThe J5019 HW-357 is commonly used with 3.7V nominal rechargeable lithium-ion batteries, including compatible 18650 cells.\u003c\/p\u003e\n\n\u003cp\u003eFor safe operation, use a suitable battery protection circuit and observe correct battery polarity.\u003c\/p\u003e\n\n\u003cp\u003eThis module is intended for single-cell charging and is not suitable for directly charging 2S or 3S series lithium battery packs.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose J5019 HW-357?\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003e2-in-1 Design:\u003c\/strong\u003e Combines battery charging and adjustable voltage boosting on one compact circuit board.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAdjustable Output:\u003c\/strong\u003e Provides flexibility for different low-power DC applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMicro USB Input:\u003c\/strong\u003e Convenient charging connection using a compatible 5V USB power source.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCompact Size:\u003c\/strong\u003e Suitable for portable electronics and space-constrained projects.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eVersatile Applications:\u003c\/strong\u003e Useful for battery-operated electronics, DIY robotics, and embedded development.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Usage Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUse compatible single-cell 3.7V lithium-ion batteries only.\u003c\/li\u003e\n\u003cli\u003eVerify correct battery polarity before connecting.\u003c\/li\u003e\n\u003cli\u003eUse a stable, regulated 5V USB power source.\u003c\/li\u003e\n\u003cli\u003eMeasure and adjust the output voltage before connecting sensitive electronics.\u003c\/li\u003e\n\u003cli\u003eDo not assume the module can deliver 2A at every output voltage.\u003c\/li\u003e\n\u003cli\u003eActual output current depends on voltage, efficiency, and thermal conditions.\u003c\/li\u003e\n\u003cli\u003eUse a suitable lithium battery protection circuit where required.\u003c\/li\u003e\n\u003cli\u003eDo not connect damaged, swollen, or unsuitable batteries.\u003c\/li\u003e\n\u003cli\u003eDo not assume uninterrupted UPS operation without checking the board's power-path behavior.\u003c\/li\u003e\n\u003cli\u003eCheck the actual PCB markings and connections before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x J5019 HW-357 Lithium Battery Charger and Boost Converter Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBattery, USB cable, and other accessories are not included unless specified separately.\u003c\/p\u003e\n\n\u003ch3\u003eBuy J5019 HW-357 Module in Pakistan\u003c\/h3\u003e\n\n\u003cp\u003eLooking for a \u003cstrong\u003eJ5019 HW-357 18650 Battery Charger and DC-DC Boost Converter in Pakistan\u003c\/strong\u003e? Shop online at \u003cstrong\u003eRobostan.pk\u003c\/strong\u003e for lithium battery modules, DC-DC converters, battery holders, charging circuits, microcontrollers, and robotics components.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOrder your J5019 HW-357 Module from Robostan.pk\u003c\/strong\u003e with nationwide delivery across Pakistan, including Lahore, Karachi, Islamabad, Rawalpindi, Faisalabad, Multan, Peshawar, and other cities.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eRobostan.pk – Build. Innovate. Create.\u003c\/strong\u003e\u003c\/p\u003e\n","brand":"ROBOSTAN","offers":[{"title":"Default Title","offer_id":68373695922542,"sku":null,"price":160.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1019\/7391\/8062\/files\/ChatGPTImageNov12_2026_07_45_19PM-4.png?v=1794566772","url":"https:\/\/robostan.pk\/products\/j5019-hw-357-18650-li-ion-battery-charger-dc-dc-boost-module","provider":"ROBOSTAN","version":"1.0","type":"link"}