{"product_id":"crofone-adp-4000-replacement-battery-36v-500mah-ni-mh","title":"Crofone ADP 4000 NS3109 Compatible Battery 3.6V 500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCrofone ADP 4000 — 3.6V Ni-MH Replacement Battery (NS3109)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.6V, 500mAh Ni-MH replacement battery for the Crofone ADP 4000 cordless phone handset. It slots into the handset battery compartment and replaces part number NS3109. Use this when the original pack no longer holds charge or fails to power the handset away from the base station.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eADP 4000 handset fit:\u003c\/strong\u003e\n    The ADP 4000 uses a 3.6V three-cell Ni-MH pack with a specific contact pitch and connector orientation. This replacement matches that footprint — same voltage, same cell count, same physical dimensions at 47.36 × 34.20 × 7.49mm.\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 the ADP 4000 base station. The BMS accepted the Ni-MH chemistry without error, and charge current tapered correctly at full capacity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst charge on the ADP 4000:\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 in cordless phones need that slow initial charge to reach rated capacity — a partial first charge causes the cells to never fully form.\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 original battery after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH cells ship in a partially discharged state and require three to five full charge-discharge cycles before reaching rated capacity. On the first cycle, the ADP 4000 handset may cut out well before you expect it to. This is not a fault — the cells are still forming. Run three full cycles through the base station and talk time will climb toward the rated level.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBase station charge light not activating after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNi-MH packs that have sat in storage can drop below the voltage threshold the ADP 4000 base station uses to detect an installed battery. The base sees the low voltage and withholds charge current rather than risk a fault. Remove the handset, wait 30 seconds, and reseat it firmly — the base station re-checks voltage on contact. If the light still does not activate, the pack may need to recover above 3.0V before the charger engages.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340065538138,"sku":"BWCS-NS3019CL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340065570906,"sku":"BWCS-NS3019CL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340065603674,"sku":"BWCS-NS3019CL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NS3019CL-1.webp?v=1778367046","url":"https:\/\/batteryweb.com\/products\/crofone-adp-4000-replacement-battery-36v-500mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}