{"product_id":"12s-50-4v-10a-charge-only-bypass-bms","title":"12S 50.4V 10A Charge-Only Bypass BMS","description":"\u003ch3 class=\"PDq2pG_selectionAnchorContainer\"\u003e12S 50.4V 10A Charge-Only Bypass BMS\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cp\u003eThe TorqueBoards 12S Charge-Only BMS is designed for compatible \u003cstrong\u003e12-series lithium-ion battery packs\u003c\/strong\u003e using a bypass discharge configuration.\u003c\/p\u003e\n\u003cp\u003eIn a charge-only setup, the BMS monitors the individual battery groups, provides cell balancing, and manages the charging path. The battery’s main discharge current bypasses the BMS and connects directly to the vehicle’s power output.\u003c\/p\u003e\n\u003cp\u003eThis configuration is commonly used in electric skateboard and DIY electric-vehicle battery packs where high discharge current is required, while the BMS is used specifically for charging protection and cell-group management.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for 12S lithium-ion battery packs\u003c\/li\u003e\n\u003cli\u003e50.4V maximum charge voltage\u003c\/li\u003e\n\u003cli\u003eCharge-only bypass configuration\u003c\/li\u003e\n\u003cli\u003eMaximum charging current: 10A\u003c\/li\u003e\n\u003cli\u003eMonitors all 12 series groups\u003c\/li\u003e\n\u003cli\u003eSupports cell balancing\u003c\/li\u003e\n\u003cli\u003eSeparate P− and B− connections\u003c\/li\u003e\n\u003cli\u003eEnclosed construction\u003c\/li\u003e\n\u003cli\u003eSuitable for electric skateboard and DIY EV battery builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCharge-Only Bypass Configuration\u003c\/h2\u003e\n\u003cp\u003eThis BMS is intended to control the battery’s charging circuit rather than carry the vehicle’s main discharge current.\u003c\/p\u003e\n\u003cp\u003eIn a typical bypass configuration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eB−\u003c\/strong\u003e connects to battery-pack negative\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eP−\u003c\/strong\u003e connects to charger negative\u003c\/li\u003e\n\u003cli\u003eCharger positive connects directly to battery-pack positive\u003c\/li\u003e\n\u003cli\u003eThe vehicle’s main discharge negative connects directly to battery negative\u003c\/li\u003e\n\u003cli\u003eThe balance connector monitors the 12 individual series groups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBecause the main discharge current bypasses the BMS, the board does not provide discharge protection for the vehicle’s main power output.\u003c\/p\u003e\n\u003cp\u003eThe complete battery and vehicle system should use appropriate:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eESC low-voltage cutoff settings\u003c\/li\u003e\n\u003cli\u003eMain-output fusing where required\u003c\/li\u003e\n\u003cli\u003eCorrect wire sizing\u003c\/li\u003e\n\u003cli\u003eShort-circuit protection\u003c\/li\u003e\n\u003cli\u003eBattery monitoring\u003c\/li\u003e\n\u003cli\u003eSafe charging procedures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery configuration:\u003c\/strong\u003e 12S\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery chemistry:\u003c\/strong\u003e Lithium-ion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal pack voltage:\u003c\/strong\u003e 44.4V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum charge voltage:\u003c\/strong\u003e 50.4V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum charging current:\u003c\/strong\u003e 10A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Charge only \/ discharge bypass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnections:\u003c\/strong\u003e P−, B− and balance connector\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cell monitoring, balancing and charge-side protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCommon Applications\u003c\/h2\u003e\n\u003cp\u003eThis BMS may be used with compatible:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e12S electric skateboard battery packs\u003c\/li\u003e\n\u003cli\u003eDIY lithium-ion battery packs\u003c\/li\u003e\n\u003cli\u003eModular electric-vehicle projects\u003c\/li\u003e\n\u003cli\u003eDrift carts and lightweight EV builds\u003c\/li\u003e\n\u003cli\u003eOther 12S battery systems using a charge-only bypass configuration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompatibility depends on battery chemistry, series count, charger voltage, charging current, balance-wire order and complete battery architecture.\u003c\/p\u003e\n\u003ch2\u003eConnection Overview\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eB−: \u003c\/strong\u003eConnects to the main negative terminal of the battery pack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eP−: \u003c\/strong\u003eConnects to the negative side of the charging port or charger circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery positive: \u003c\/strong\u003eIn a typical charge-only setup, charger positive connects directly to pack positive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalance connector: \u003c\/strong\u003eConnects to the battery’s individual series groups in the correct sequential order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNTC: \u003c\/strong\u003eThe NTC lead is capped and not used in the standard TorqueBoards bypass configuration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x 12S 10A charge-only bypass BMS\u003c\/li\u003e\n\u003cli\u003e1x 12S \u003cspan\u003eBalance Wire Harness\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBalance-wire harnesses, chargers, charging ports, connectors and additional wiring are not included unless specifically stated.\u003c\/p\u003e\n\u003ch2\u003eCompatibility Requirements\u003c\/h2\u003e\n\u003cp\u003eBefore installation, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe battery is exactly 12S\u003c\/li\u003e\n\u003cli\u003eThe battery uses compatible lithium-ion cells\u003c\/li\u003e\n\u003cli\u003eThe charger output does not exceed 50.4V\u003c\/li\u003e\n\u003cli\u003eCharging current does not exceed 10A\u003c\/li\u003e\n\u003cli\u003eThe balance connector matches the BMS\u003c\/li\u003e\n\u003cli\u003eBalance-wire sequence is correct\u003c\/li\u003e\n\u003cli\u003eP− and B− are wired correctly\u003c\/li\u003e\n\u003cli\u003eThe main discharge path bypasses the BMS\u003c\/li\u003e\n\u003cli\u003eThe complete system includes appropriate discharge-side protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not use this BMS with a different series count or incompatible battery chemistry.\u003c\/p\u003e\n\u003ch2\u003eInstallation and Verification\u003c\/h2\u003e\n\u003cp\u003eIncorrect wiring can permanently damage the BMS, cells, charger or connected electronics.\u003c\/p\u003e\n\u003cp\u003eBefore connecting the BMS:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eMeasure every cell-group voltage.\u003c\/li\u003e\n\u003cli\u003eConfirm all groups are within a safe and similar voltage range.\u003c\/li\u003e\n\u003cli\u003eVerify the complete pack voltage.\u003c\/li\u003e\n\u003cli\u003eConfirm the balance-wire sequence.\u003c\/li\u003e\n\u003cli\u003eMeasure sequentially from battery negative to every balance lead.\u003c\/li\u003e\n\u003cli\u003eConfirm the P− and B− connections.\u003c\/li\u003e\n\u003cli\u003eVerify charger polarity and output voltage.\u003c\/li\u003e\n\u003cli\u003eInsulate all exposed conductors.\u003c\/li\u003e\n\u003cli\u003eConfirm the vehicle discharge circuit bypasses the BMS.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eNever connect the balance plug until every balance-wire position has been verified with a multimeter.\u003c\/p\u003e\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\u003cp\u003eWhen installed as a charge-only bypass BMS, it does not provide main-output:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDischarge overcurrent protection\u003c\/li\u003e\n\u003cli\u003eShort-circuit cutoff\u003c\/li\u003e\n\u003cli\u003eLow-voltage discharge cutoff\u003c\/li\u003e\n\u003cli\u003eMotor-current management\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not use or describe this as a full charge-and-discharge BMS when wired in bypass mode.\u003c\/p\u003e\n\u003ch2\u003eSafety Information\u003c\/h2\u003e\n\u003cp\u003eLithium-ion battery packs can cause fire, serious injury or property damage if incorrectly assembled, wired, charged, damaged or serviced.\u003c\/p\u003e\n\u003cp\u003eInstallation should only be completed by someone experienced with lithium-ion battery architecture, polarity verification, balance-wire sequencing, BMS wiring, insulation and short-circuit prevention.\u003c\/p\u003e\n\u003cp\u003eNever connect a charger until every connection and voltage has been verified.\u003c\/p\u003e","brand":"TorqueBoards","offers":[{"title":"Default Title","offer_id":52432892756199,"sku":null,"price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2363\/7649\/files\/12S50.4V10ABypassBMS.webp?v=1785456059","url":"https:\/\/diyelectricskateboard.com\/products\/12s-50-4v-10a-charge-only-bypass-bms","provider":"DIY Electric Skateboard","version":"1.0","type":"link"}