{"product_id":"wurth-h-28-ma-replacement-battery-28v-4000mah-li-ion","title":"Würth H 28-MA 28V Replacement Battery 4000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eWurth H 28-MA Series — 28V Li-ion Replacement Battery (0700 956 730)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 28V Li-ion battery pack replaces the OEM unit (part no. 0700 956 730) across the Wurth H 28-MA, BS 28-A Combi, Master 28V, and Master H 28-MA cordless tool platforms. Capacity is 4000mAh (112Wh). The cell voltage and connector match the original spec — no adapter required.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eH 28-MA platform compatibility:\u003c\/strong\u003e\n    The H 28-MA, BS 28-A Combi, and Master 28V share the same 28V rail, battery footprint, and BMS communication protocol. One pack works across all four models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through motor-start inrush cycles on drill and impact driver loads. The BMS held stable at the overcurrent threshold — no false trips on normal trigger pulls. Cell balance after full discharge came within 20mV across the pack.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use load conditioning:\u003c\/strong\u003e\n    On initial use, run the tool at half load for two full discharge-charge cycles before applying maximum torque or sustained impact driver loads. This lets the BMS profile the motor's inrush draw and set accurate overcurrent thresholds for your specific tool.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS cutoff on motor-start inrush with the H 28-MA drill\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger on a drill or impact driver, the motor draws a current spike two to four times higher than the running load — this lasts only milliseconds, but a cold or discharged BMS can read it as a fault. The protection circuit trips, and the tool goes dead mid-use. A BMS that hasn't profiled your motor yet is especially prone to this on the first few cycles. Running break-in cycles at reduced load lets the BMS learn the inrush signature and stops false cutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCharger not recognising the pack after storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells that have sat unused for several months can drop below the charger's acceptance voltage — typically around 2.5V per cell. The Wurth charger sees the low voltage, flags it as a damaged or incompatible pack, and refuses to initiate a charge cycle. If the indicator blinks red and never transitions, the pack is likely below threshold. Most Wurth chargers have a recovery or \"boost\" mode — hold the pack on charge for 10–15 minutes and the charger will attempt a low-current pre-charge to bring cells back above 3.0V per cell before switching to normal charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416024383578,"sku":"BWCS-MKV280PX-1","price":126.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416024416346,"sku":"BWCS-MKV280PX-2","price":148.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416024449114,"sku":"BWCS-MKV280PX-3","price":165.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MKV280PX-1.webp?v=1779759484","url":"https:\/\/batteryweb.com\/products\/wurth-h-28-ma-replacement-battery-28v-4000mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}