{"product_id":"dsc-3g4000-replacement-battery-72v-2000mah-ni-mh","title":"DSC 3G4000 Replacement Battery 7.2V 2000mAh Ni-MH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDSC 3G4000 \/ LE4000 Series — 7.2V Ni-MH Replacement Battery (3G4000-BATT)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V 2000mAh Ni-MH rechargeable battery for the DSC 3G4000 and LE4000 alarm control panels, including 3G4000 Cellular Communicators. It replaces OEM part 3G4000-BATT and restores backup power to the panel during mains outages. Capacity is 2000mAh (14.4Wh), matching the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3G4000 and LE4000 panel fit:\u003c\/strong\u003e\n    Both panels run the same 7.2V battery rail with identical connector pinout and BMS handshake protocol. A single cell covers both units — no adapter or wiring change needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a 3G4000 panel under mains-cut conditions. The BMS accepted charge without fault codes and held voltage above the panel's low-battery threshold through a full discharge cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFloat charge conditioning after install:\u003c\/strong\u003e\n    Do not run a zone test immediately after fitting this cell. Allow 24–48 hours on float charge first. Installing a fresh Ni-MH cell and testing too soon will trigger a false low-battery report — the panel needs time to recognise the new cell as fully charged.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm panel showing low battery hours after installing new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a known behaviour with Ni-MH cells on DSC panels, not a faulty battery. The panel's charge monitor reads voltage during the first float cycle and reports low until the cell reaches a stable charge state. A fresh cell sitting at the mid-point of its first charge will read below the panel's acceptance threshold. Leave the panel powered on mains for 48 hours — the low-battery alert will clear once the cell crosses approximately 8.4V fully charged.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm losing programming during a mains outage after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the panel drops its configuration during a power cut shortly after a battery replacement, the new cell has not yet completed its conditioning cycle. The panel backup circuit requires the cell to hold a minimum voltage under load — a partially charged Ni-MH cell collapses under draw faster than the panel expects. The fix is straightforward: restore mains power, allow a full 48-hour charge cycle, then test with a deliberate mains-cut. Check the panel's battery voltage reading in the engineer menu — it should show above 7.0V under load before relying on backup.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43309833846874,"sku":"BWCS-DSC400BT-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43309833879642,"sku":"BWCS-DSC400BT-2","price":40.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43309833912410,"sku":"BWCS-DSC400BT-3","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DSC400BT-1.webp?v=1777868234","url":"https:\/\/batteryweb.com\/products\/dsc-3g4000-replacement-battery-72v-2000mah-ni-mh","provider":"BatteryWeb","version":"1.0","type":"link"}