{"product_id":"polycom-ptb500-replacement-battery-48v-700mah-ni-mh","title":"Polycom PTB500 Cordless Phone Compatible Battery 4.8V 700mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePolycom PTB500 \/ PTB610 \/ PTS330 — 4.8V Ni-MH Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 4.8V, 700mAh nickel-metal hydride battery for Polycom DECT cordless handsets. It fits the PTB500, PTB610, PTS330, SKPT410, and more than ten additional models in this range. Same voltage, same connector, same physical footprint as the original pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePTB500 \/ PTB610 \/ PTS330 series fit:\u003c\/strong\u003e\n    These handsets share a common 4.8V NiMH cell configuration, identical connector orientation, and matching BMS communication protocol — so one pack covers the full lineup without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this pack through charge and discharge cycles on a PTB500 handset. The base station accepted charge immediately, the BMS reported correct voltage at each stage, and the handset showed full signal bars throughout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-charge protocol for NiMH handsets:\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 ship partially discharged and need a slow, uninterrupted initial charge to reach rated capacity — a shorter first charge will leave you with noticeably less 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\"\u003eRange drops after battery swap on DECT handsets\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eDECT transmitters draw a short burst of current every time the handset communicates with the base. A freshly installed NiMH battery that hasn't completed its first conditioning cycle has higher internal resistance than a fully cycled pack. That resistance causes voltage to sag under RF transmit load, which the handset interprets as a weak signal — so it reduces transmit power. Run three to five full charge and discharge cycles and the internal resistance drops to spec, restoring full range.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station shows no charge or error light after fitting new battery\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNiMH batteries lose voltage during storage. If the pack sits long enough, its resting voltage can fall below the threshold the base station uses to confirm a valid battery is seated. The charger sees a voltage it doesn't recognise and refuses to initiate a charge cycle. Remove the handset, wait ten seconds, and reseat it firmly — this resets the charge controller. If the error persists, check that the handset contacts are clean and making solid contact with the base cradle pins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339962220634,"sku":"BWCS-TS9031CL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339962253402,"sku":"BWCS-TS9031CL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339962286170,"sku":"BWCS-TS9031CL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TS9031CL-1.webp?v=1778367002","url":"https:\/\/batteryweb.com\/products\/polycom-ptb500-replacement-battery-48v-700mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}