{"product_id":"telesys-ts5020-replacement-battery-36v-1200mah-ni-mh","title":"Telesys TS5020 Replacement Battery 3.6V 1200mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTelesys TS5020 — 3.6V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V 1200mAh Ni-MH replacement battery for the Telesys TS5020 cordless phone handset. It slots into the handset battery compartment and restores wireless operation when the original cell no longer holds charge. Voltage and capacity match the stock specification exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTS5020 handset fit:\u003c\/strong\u003e\n    The TS5020 runs a single-cell Ni-MH pack at 3.6V nominal. The base station charges through fixed contact pins and the BMS in the handset monitors charge termination by delta-V detection — a mismatch in cell chemistry or voltage would cause the base to reject the charge cycle entirely.\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 Ni-MH test equipment and confirmed the BMS accepted delta-V termination correctly. Capacity reading at the end of cycle three reached rated capacity within normal tolerance.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge protocol for Ni-MH handsets:\u003c\/strong\u003e\n    After installing, seat the handset in the base and leave it undisturbed for a full 16 hours before first use. Ni-MH cells in cordless phones need a slow, uninterrupted initial charge to fully form — pulling the handset early locks in a lower usable capacity from the start.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station charge light stays off or shows error on a new Ni-MH pack\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells lose voltage during storage. If a new battery sits in a warehouse for several months, its resting voltage can drop below the threshold the TS5020 base expects to see before initiating a charge cycle. The base interprets this as a missing or faulty pack and shows no charge activity. Placing the handset in the base and waiting up to 30 minutes allows the charger circuit to trickle-feed enough current to bring the cell voltage back above the acceptance threshold — after that, normal charging begins.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRange drops noticeably mid-call after fitting a replacement battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDECT transmit circuitry in the TS5020 draws a current spike during each radio burst. A Ni-MH cell that has not completed its first few conditioning cycles has higher internal resistance, which causes voltage to sag under that RF load. The handset detects the sag and reduces transmit power to protect the circuit — range falls as a result. Run three to five full charge-and-use cycles and internal resistance drops; voltage sag under RF load reduces and range returns to normal.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340035260506,"sku":"BWCS-ADL930CL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340035293274,"sku":"BWCS-ADL930CL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340035326042,"sku":"BWCS-ADL930CL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ADL930CL-1.webp?v=1778367024","url":"https:\/\/batteryweb.com\/products\/telesys-ts5020-replacement-battery-36v-1200mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}