{"product_id":"flex-bbm-596b-replacement-battery-96v-2100mah-ni-mh","title":"FLEX BBM 596B Cordless Drill Replacement Battery 9.6V 2100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFLEX BBM 596B \/ BS 596B — 9.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9.6V, 2100mAh Ni-MH replacement battery for the FLEX BBM 596B and BS 596B cordless drill\/driver series. It slots into the same battery bay as the original pack and uses the same connector pinout. Capacity is rated at 2100mAh (20.16Wh) — drawn directly from product data, not estimated.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBBM 596B and BS 596B compatibility:\u003c\/strong\u003e\n    Both models run the same 9.6V rail with an identical battery bay and connector. The BMS handshake uses the same thermistor line, so the charger reads cell temperature correctly on either platform.\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 a 9.6V drill platform. The BMS held through repeated trigger pulls without tripping the overcurrent cutoff, and cell voltage recovery after load was consistent across cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBreak-in procedure for drill use:\u003c\/strong\u003e\n    On first use, run the drill at half load — light fastener driving or low-torque drilling — for two full cycles before pushing maximum torque applications. This lets the BMS profile the motor inrush current draw before it finalises overcurrent protection thresholds.\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 in the BBM 596B\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen you pull the trigger on a cordless drill, current spikes sharply in the first 50–150 milliseconds as the motor overcomes static load. On a Ni-MH pack, that inrush can briefly exceed the BMS overcurrent threshold — especially on a new or cold pack where internal resistance is slightly elevated. The BMS interprets the spike as a fault and cuts output. Running two break-in cycles at reduced load trains the BMS to distinguish normal inrush from a genuine fault condition.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDrill bogs under load after the battery reads full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the drill feels weak or hesitates mid-cut even with a charged pack, the most likely cause is voltage sag — the terminal voltage drops under load because contact resistance at the battery rail has increased. Clean both the battery terminals and the tool's battery bay contacts with a dry cloth or fine emery paper. After cleaning, check open-circuit voltage with a multimeter — a healthy 9.6V Ni-MH pack at full charge should read between 10.5V and 11.0V at rest before dismissing the contacts as the fault source.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416068980826,"sku":"BWCS-BST974PW-1","price":76.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416069013594,"sku":"BWCS-BST974PW-2","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416069046362,"sku":"BWCS-BST974PW-3","price":98.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BST974PW-1.webp?v=1779760040","url":"https:\/\/batteryweb.com\/products\/flex-bbm-596b-replacement-battery-96v-2100mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}