{"product_id":"src-jk-2696-jkbms-bd4a17s4p-7s-17s-active-balance-bms-balance-current-0-4a-continuous-current-40a-lifepo4-li-ion-lto-battery","title":"JKBMS BD4A17S4P Active Balance Smart BMS 7S-17S 40A 0.4A Bluetooth RS485 for Li-ion LiFePO4 LTO","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe \u003ca href=\"https:\/\/tsolar.top\/collections\/jkbms-jikong-bms\" title=\"JKBMS - JIKONG BMS\"\u003eJKBMS\u003c\/a\u003e BD4A17S4P is an active balance \u003ca href=\"https:\/\/tsolar.top\/collections\/smart-bms\" title=\"Smart BMS\"\u003esmart BMS\u003c\/a\u003e for multi-cell battery packs, supporting Li-ion, LiFePO4 and LTO chemistries across 7S to 17S (chemistry-dependent). It is battery-pack self-powered, includes built-in Bluetooth for Android\/iOS monitoring, and supports RS485 communication by default (CANBUS available as a customized interface).\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSupported battery strings: Li-ion 7S–17S; LiFePO4 8S–17S; LTO 12S–17S\u003c\/li\u003e\n\u003cli\u003eActive balance (Full State On), balance current: 0.4A (400mA)\u003c\/li\u003e\n\u003cli\u003eContinuous charge current: 40A; continuous discharge current: 40A\u003c\/li\u003e\n\u003cli\u003eMaximum discharge current (MAX 2min): 60A\u003c\/li\u003e\n\u003cli\u003eBuilt-in Bluetooth; supports Android \u0026amp; iOS phones\u003c\/li\u003e\n\u003cli\u003eInterfaces: RS485 (default); CANBUS (customized option)\u003c\/li\u003e\n\u003cli\u003eSingle cell voltage dropout detection supported\u003c\/li\u003e\n\u003cli\u003eShort circuit protection supported; temperature protection supported\u003c\/li\u003e\n\u003cli\u003eCoulomb counter supported; SoC estimation accuracy error \u0026lt; 8% (operating conditions)\u003c\/li\u003e\n\u003cli\u003eSmart working modes described: Storage Mode, Normal Working Mode, Shutdown, Standby Mode (set time 1–30 days)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eBD4A17S4P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery type\u003c\/td\u003e\n\u003ctd\u003eLi-ion \/ LiFePO4 \/ LTO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of battery strings (Li-ion)\u003c\/td\u003e\n\u003ctd\u003e7S–17S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of battery strings (LiFePO4)\u003c\/td\u003e\n\u003ctd\u003e8S–17S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of battery strings (LTO)\u003c\/td\u003e\n\u003ctd\u003e12S–17S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWiring method \/ output\u003c\/td\u003e\n\u003ctd\u003eSame port \/ Common Port\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalance method\u003c\/td\u003e\n\u003ctd\u003eActive Balance (Full State On)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBalance current\u003c\/td\u003e\n\u003ctd\u003e0.4A (400mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductive resistance in main circuit\u003c\/td\u003e\n\u003ctd\u003e2.8mΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous charge current\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous discharge current\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum discharge current\u003c\/td\u003e\n\u003ctd\u003e60A (MAX 2min)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge protection current (ADJ)\u003c\/td\u003e\n\u003ctd\u003e10–40A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver current detect delay\u003c\/td\u003e\n\u003ctd\u003e2–120S adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle cell voltage detection range\u003c\/td\u003e\n\u003ctd\u003e0–5V, error \u0026lt; 10mV over full operating range; typical error \u0026lt; 5mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle cell voltage range (supported)\u003c\/td\u003e\n\u003ctd\u003e1–5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage acquisition accuracy\u003c\/td\u003e\n\u003ctd\u003e±5mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal voltage detection range\u003c\/td\u003e\n\u003ctd\u003e0–100V, \u0026lt; 0.5%FSR (FSR = full scale)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent sense shunt\u003c\/td\u003e\n\u003ctd\u003e-150A to 300A, error \u0026lt; 0.5%FSR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge protection voltage\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver charge release voltage\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver discharge protection voltage\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver discharge release voltage\u003c\/td\u003e\n\u003ctd\u003e1.2–4.35V adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature detection\u003c\/td\u003e\n\u003ctd\u003e-40 to 125°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity of temperature detection\u003c\/td\u003e\n\u003ctd\u003e3 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStoring temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating power consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 5mA (without communication) \/ 15mA (485\/CAN)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby power consumption\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 2mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort circuit protection\u003c\/td\u003e\n\u003ctd\u003eYES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemp protection\u003c\/td\u003e\n\u003ctd\u003eYES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoulomb counter\u003c\/td\u003e\n\u003ctd\u003eYES\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBluetooth supported\u003c\/td\u003e\n\u003ctd\u003eiOS \/ Android\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther interfaces (default)\u003c\/td\u003e\n\u003ctd\u003eRS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther interfaces (customized)\u003c\/td\u003e\n\u003ctd\u003eCANBUS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003e110*73*18mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply mode\u003c\/td\u003e\n\u003ctd\u003eThe battery pack is self-powered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery remaining capacity accuracy\u003c\/td\u003e\n\u003ctd\u003eError range is less than 8%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Cycle AH cumulative value\u003c\/td\u003e\n\u003ctd\u003eHalf of the charge\/discharge value\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eCommunication \/ Auxiliary Ports (labeling)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCANBUS (need customization): GND \/ CAN_H \/ CAN_L\u003c\/li\u003e\n\u003cli\u003eRS485 (by default): port area labeled with GPS; pin labels shown: GND \/ RX \/ TX \/ VCC\u003c\/li\u003e\n\u003cli\u003eLCD (by default): K- \/ K+ \/ GND \/ B \/ A \/ VCC\u003c\/li\u003e\n\u003cli\u003eHeat Function (need customization): connector labeled for heating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eProtection Functions (six items described)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOver charge protection: Prevent over-charging affects battery life\u003c\/li\u003e\n\u003cli\u003eShort circuit protection: Automatic protection when short circuit protection\u003c\/li\u003e\n\u003cli\u003eOver discharge protection: Prevent the battery from running out\u003c\/li\u003e\n\u003cli\u003eOver current protection: Prevent the current from exceeding the battery range\u003c\/li\u003e\n\u003cli\u003eAll-in protection: Prevent cable drop or poor contact\u003c\/li\u003e\n\u003cli\u003eOver temp protection: Prevent the battery from over heating\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBattery pack protection and active balancing for Li-ion (7S–17S), LiFePO4 (8S–17S), and LTO (12S–17S) packs\u003c\/li\u003e\n\u003cli\u003eEnergy storage battery packs requiring Bluetooth monitoring and RS485\/CAN communication integration\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor wiring, communication interface selection, or app setup assistance, contact customer support at service@tsolar.top or visit https:\/\/tsolar.top\/.\u003c\/p\u003e\u003ch2\u003eNotes\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eSome promotional materials may display other JK BMS models and example app screenshots with sample values; specifications for purchase should follow the BD4A17S4P parameters listed above.\u003c\/li\u003e\n\u003cli\u003eBluetooth usage guidance provided: download the specified Bluetooth application, activate the BMS, then select the relevant serial number to view data.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2 id=\"details\"\u003eDetails\u003c\/h2\u003e\u003cdiv class=\"details-gallery\"\u003e\n\u003cimg alt=\"JKBMS BD4A17S4P active balance smart BMS for 7S–17S packs with Bluetooth and RS485 communication\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current.jpg?v=1780114575\"\u003e\u003cp\u003eBuilt for multi‑cell packs, the BD4A17S4P combines active balancing with Bluetooth monitoring and RS485 communication.\u003c\/p\u003e\n\u003cimg alt=\"JK BMS higher-current smart BMS module with heating function option and RS485\/CAN interface callouts\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_93489f61-b38e-41a9-a469-1a5848e439e7.jpg?v=1780114581\"\u003e\u003cimg alt=\"Exploded view of the smart BMS showing enclosure, PCB layers, connectors, and main components layout\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current.png?v=1780114591\"\u003e\u003cimg alt=\"BMS connector pinout close-up with RS485 by default and optional CANBUS, LCD, GPS and heating headers\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_e455a0ca-8528-49f4-8543-c4a7411e9e5a.jpg?v=1780114598\"\u003e\u003cp\u003eWiring stays straightforward with RS485 included by default, plus expansion headers for optional interfaces depending on configuration.\u003c\/p\u003e\n\u003cimg alt=\"Bluetooth battery monitoring app screen showing pack voltage, current, SOC, temperatures, and per-cell voltages\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_c39ae2b2-66dd-45d0-a0a8-3c3fe097ff66.jpg?v=1780114604\"\u003e\u003cp\u003eBluetooth support lets you check pack voltage, current, SOC and per‑cell data from a phone app.\u003c\/p\u003e\n\u003cimg alt=\"Mobile app screenshots for device list, settings, and live dashboard with per-cell voltages and status indicators\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_db25dfd6-88f5-4bea-8fa1-85ffb644a5fb.jpg?v=1780114613\"\u003e\u003cimg alt=\"Graphic summarizing BMS safety protections including overcharge, overdischarge, short circuit, overcurrent and overtemperature\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_2bbc0081-47df-4548-b46f-7abaefd371f4.jpg?v=1780114624\"\u003e\u003cimg alt=\"Smart energy working mode switching chart for storage, normal working, shutdown and standby modes\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_0299d802-99af-415f-baf3-30109347e4cb.jpg?v=1780114634\"\u003e\u003cp\u003eMultiple working modes help reduce standby drain during storage while keeping the pack protected in normal use.\u003c\/p\u003e\n\u003cimg alt=\"Specification comparison table for JK BMS models listing supported strings, currents, interfaces, and protection functions\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/JKBMS-BD4A17S4P-7S-17S-Active-Balance-BMS-Balance-Current_0ea1ed53-521e-4ba5-8586-3bace259cb19.jpg?v=1780114641\"\u003e\u003cp\u003eA model comparison chart helps confirm supported cell counts, current ratings and interface options before choosing a \u003ca href=\"https:\/\/tsolar.top\/collections\/battery-bms\" title=\"Battery BMS\"\u003eBMS\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"JIKONG","offers":[{"title":"Default Title","offer_id":52312353571090,"sku":"jk-2696-","price":35.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0863\/2860\/6994\/files\/BD4A17S4P-1-JKBMS-7S-17S-20S-24S-Active-Balance-BMS-Balance-Current-0.4A-0.6A-Continuous-Current-40A-60A-80A-Lifepo4-li-ion-LTO-Battery.jpg?v=1780067778","url":"https:\/\/tsolar.top\/products\/src-jk-2696-jkbms-bd4a17s4p-7s-17s-active-balance-bms-balance-current-0-4a-continuous-current-40a-lifepo4-li-ion-lto-battery","provider":"TSolar","version":"1.0","type":"link"}