{"product_id":"telefunken-cs4-replacement-battery-48v-1500mah-ni-mh","title":"Telefunken CS4 Replacement Battery 4.8V 1500mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTelefunken CS4 \/ CS5 \/ CS6 \/ CA6 Series — 4.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 4.8V 1500mAh Ni-MH battery replaces the original handset battery in Telefunken CS4, CS5, CS6, and CA6 cordless DECT phones. It restores full handset operation without replacing the entire phone. Voltage and cell count match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCS4, CS5, CS6, CA6 compatibility:\u003c\/strong\u003e\n    These Telefunken handsets share the same 4.8V four-cell NiMH pack format, connector pinout, and physical envelope. The same battery fits across this range because Telefunken built the CS and CA series on a common handset platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through full charge and discharge cycles on DECT handset hardware. The BMS accepted charge correctly from the base station cradle, and the cells balanced without heat anomalies across multiple cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge after installation:\u003c\/strong\u003e\n    After fitting, seat the handset in the base and leave it for a full 16 hours before use. NiMH cells arriving from storage are partially discharged — a slow initial charge lets each cell reach rated capacity rather than the partial fill a standard charge cycle delivers.\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 the original battery after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH cells need three to five full charge and discharge cycles before they deliver rated capacity. A new pack straight from storage has suppressed capacity — this is a chemistry characteristic, not a fault. Each complete cycle conditions the cells and recovers usable capacity incrementally. By cycle five, the pack should be performing at or close to the rated 1500mAh.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station charge light not activating with new battery installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH packs can drop to very low voltages during storage. Some Telefunken base stations will not initiate a charge cycle if the incoming voltage sits below the acceptance threshold — typically around 3.6V for a four-cell pack. The base interprets a deeply discharged pack as an absent or faulty battery. To recover it, briefly charge the pack directly at a low current using an external NiMH charger until voltage reaches approximately 4.0V, then return the handset to the base.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339942690906,"sku":"BWCS-BT098CL-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339942723674,"sku":"BWCS-BT098CL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339942756442,"sku":"BWCS-BT098CL-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BT098CL-1.webp?v=1778366983","url":"https:\/\/batteryweb.com\/products\/telefunken-cs4-replacement-battery-48v-1500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}