{"product_id":"sony-spp-a2770-replacement-battery-36v-1200mah-ni-mh","title":"Sony SPP-A2770 Cordless Phone Replacement Battery BP-T38 3.6V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSony SPP-A2770 \/ SPP-A2780 Series — 3.6V Ni-MH Replacement Battery (BP-T38)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 1200mAh Ni-MH replacement battery for Sony cordless phone handsets using the BP-T38 pack. It fits the SPP-A2770, SPP-A2780, SPP-H273, and SPP-S2720, along with three additional models in the same family. Capacity figures match the original Sony spec — 1200mAh at 4.32Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSPP-series handset fit:\u003c\/strong\u003e\n    These Sony models share the same 3.6V single-cell NiMH architecture, BP-T38 connector footprint, and base-station charge contacts. The BMS handshake across the family is identical, so one pack covers all listed models without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a SPP-series handset and confirmed the base station accepted the charge cycle without error. The BMS held the termination voltage correctly and did not trigger a false full-charge cutoff on the first conditioning pass.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for NiMH 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. NiMH cells in cordless phone packs reach rated capacity only after this slow initial charge — skipping it will leave you with noticeably shorter talk time from day one.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SPP-A2770 loses range after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH voltage under RF transmit load drops faster than the handset's power circuit expects when a new or unconditioned pack is installed. The SPP-A2770 RF transmitter draws a short high-current burst every time it pings the base station. If the pack's internal resistance is still elevated from storage, voltage sags enough during that burst to reduce effective transmit power. Running two to three full charge-discharge cycles brings internal resistance down and restores normal range.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows no charge light after installing a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH packs lose voltage during warehouse storage and can arrive below the threshold the Sony base station needs to begin a standard charge cycle. The base detects a voltage too low to confirm a valid battery and withholds the charge current. Fix this by placing the handset in the base for 30 minutes — the trickle pre-charge circuit will bring the pack up to approximately 3.3V, at which point the base switches to its normal charge mode and the indicator activates.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340090146906,"sku":"BWCS-BPT38CL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340090179674,"sku":"BWCS-BPT38CL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340090212442,"sku":"BWCS-BPT38CL-3","price":33.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BPT38CL-1.webp?v=1778367024","url":"https:\/\/batteryweb.com\/products\/sony-spp-a2770-replacement-battery-36v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}