{"product_id":"bt-granite-replacement-battery-37v-500mah-li-ion","title":"BT Granite Cordless Phone Compatible Battery 3.7V 500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBT Granite — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 500mAh Li-ion battery replaces the original cell in BT Granite cordless handsets. It fits the Granite and British Telekom Granite models and restores power to handsets that no longer hold a charge. Capacity is sourced from product data at 500mAh (1.85Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGranite handset compatibility:\u003c\/strong\u003e\n    The Granite and British Telekom Granite share the same 3.7V Li-ion cell format, connector pinout, and physical footprint — 43 x 28 x 4mm. One battery covers both variants without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge and discharge cycles on a BT Granite handset. The battery accepted charge from the base station immediately, and the BMS held voltage within the expected 3.7V nominal window throughout the test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after installation:\u003c\/strong\u003e\n    Place the handset in the base and leave it for a full uninterrupted charge cycle before use. Li-ion cells shipped in partial-charge storage state need one complete charge to calibrate correctly with the handset's charge indicator circuit.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eTalk time shorter than expected after fitting the new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new Li-ion cell often reads shorter talk time than rated for the first two or three cycles. This happens because the cell ships at a reduced storage charge and the handset's fuel gauge is not yet calibrated to the new cell's actual capacity. Run two or three full charge-and-use cycles and the reported capacity will stabilise. If talk time remains short after five cycles, check that the base station charging contacts are clean and making firm contact.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station charge light not activating after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen a replacement Li-ion cell arrives from storage at a voltage below the base station's acceptance threshold, the charger circuit may not trigger. Remove the handset from the base, wait 10 seconds, then reseat it firmly — this resets the charge detection handshake. If the light still does not activate, check the base contacts with a multimeter for 5V DC output. A contact clean with a dry cloth resolves most cases where voltage is present but the charge light stays off.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340056723546,"sku":"BWCS-P28115CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340056756314,"sku":"BWCS-P28115CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340056789082,"sku":"BWCS-P28115CL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-P28115CL-1.webp?v=1778367047","url":"https:\/\/batteryweb.com\/products\/bt-granite-replacement-battery-37v-500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}