{"product_id":"toshiba-bt-311-replacement-battery-36v-700mah-ni-mh","title":"Toshiba BT-311 Replacement Battery 3.6V 700mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eToshiba BT-311 \/ FD-9859 Series — 3.6V Ni-MH Replacement Battery (TBR-8000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 700mAh Ni-MH battery for Toshiba cordless phones including the BT-311, FD-4809, FD-9839, and FD-9859. It replaces OEM part numbers TBR-8000 and TRB-1981. The battery slots into the handset and restores wireless operation once the original pack no longer holds a charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBT-311 and FD-series compatibility:\u003c\/strong\u003e\n    These Toshiba handsets share the same 3.6V NiMH cell configuration, connector pin-out, and physical housing slot. A single replacement pack covers all models listed because the base station charging circuit draws to the same voltage threshold across the range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through charge and discharge on a Toshiba BT-311 handset. The base station accepted the battery without error, and the BMS balanced cell voltage across all three cells within the first two charge cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for NiMH handsets:\u003c\/strong\u003e\n    After installing, place the handset in the base cradle and leave it for a full 16 hours before first use. NiMH cordless phone batteries ship in a partially discharged state — a slow initial charge is what gets them to rated 700mAh capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy your Toshiba handset loses range after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH cells that haven't completed conditioning cycles run at slightly lower resting voltage — typically 3.4V instead of a full 3.6V. The handset's RF transmitter pulls harder on the pack during active calls, and a low-voltage cell sags further under that load. The DECT radio then reduces transmit power to compensate, which cuts effective range. Run three to five full charge-discharge cycles and resting voltage stabilises, restoring normal transmit behaviour.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows no charge light after installing the new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eToshiba base stations check for a minimum voltage before beginning the charge cycle — a pack fresh from storage can sit below that threshold. Remove the handset, leave the battery in place for ten minutes at room temperature, then reseat it firmly in the cradle. If the charge indicator still doesn't activate, check that both contacts on the handset base are clean and making full contact. A brief wipe with a dry cloth on the charging pins is usually enough to complete the circuit.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340080971866,"sku":"BWCS-P501CL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340081004634,"sku":"BWCS-P501CL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340081037402,"sku":"BWCS-P501CL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-P501CL-1.webp?v=1778367047","url":"https:\/\/batteryweb.com\/products\/toshiba-bt-311-replacement-battery-36v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}