{"product_id":"southwestern-bell-bp36mlx-replacement-battery-36v-600mah-ni-mh","title":"Southwestern Bell BP36MLX Cordless Phone Replacement Battery 3.6V 600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSouthwestern Bell BP36MLX Series — 3.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 600mAh Ni-MH replacement battery for Southwestern Bell cordless phone handsets. It fits the BP36MLX, BP36MLX400, FF1185, FF1187, and over 69 additional models in this cordless phone lineup. Install it to restore handset operation when the original pack no longer holds a charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBP36MLX platform compatibility:\u003c\/strong\u003e\n    These models share the same 3.6V single-cell Ni-MH pack format, connector orientation, and physical envelope. The base station charging circuit expects that voltage window, so swapping to a different cell count or chemistry will cause charging errors or no-charge states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through the base station charging circuit and confirmed the BMS accepted charge without error. Cell voltage rose steadily to 4.2V at full charge termination, and the handset powered on and registered to the base without issue.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge on Ni-MH cordless packs:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped from storage sit at partial charge — skipping this slow initial charge leaves rated capacity unreached for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station showing no charge or error light after swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH batteries in storage self-discharge to a low resting voltage — sometimes below the threshold the base station uses to detect a valid pack. When the charger circuit sees a voltage it considers too low, it refuses to initiate a charge cycle and shows an error light instead. To recover, hold the battery contacts briefly across the base terminals by hand for 10–15 seconds, or use a separate Ni-MH charger to bring the pack above 3.0V first. Once the pack crosses that threshold, the base station will recognise it and begin a normal charge cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRange drops noticeably during calls after installing a new battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eReduced range after a battery swap usually points to voltage sag under RF transmit load, not the battery itself being faulty. A Ni-MH cell that hasn't completed two or three full charge-discharge cycles hasn't reached its rated capacity, so internal resistance stays higher than normal and voltage dips when the handset transmits. That dip cuts the RF output power, which shortens usable range. Run three full cycles — full charge in base, use until handset shows low battery, then full 16-hour recharge — and retest range before drawing any other conclusions.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339956617306,"sku":"BWCS-P403CL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339956650074,"sku":"BWCS-P403CL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339956682842,"sku":"BWCS-P403CL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-P403CL-1.webp?v=1778367001","url":"https:\/\/batteryweb.com\/products\/southwestern-bell-bp36mlx-replacement-battery-36v-600mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}