{"product_id":"daitem-dc643-replacement-battery-108v-6500mah-li-socl2","title":"Daitem DC643 Replacement Battery 10.8V 6500mAh Li-SOCl2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDaitem DC643 \/ C104 Compact — 10.8V Li-SOCl2 Replacement Battery (BATV16)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V 6500mAh lithium thionyl chloride cell that fits the Daitem DC643 and C104 Compact alarm panel. It replaces OEM part BATV16 and sits in the panel's backup power circuit. When mains power drops, this cell keeps the panel, siren, and communication modules live.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDC643 and C104 Compact compatibility:\u003c\/strong\u003e\n    Both panels share the same backup battery bay, connector pinout, and 10.8V charging rail. The panel BMS expects Li-SOCl2 chemistry — substituting a different chemistry type trips a fault on the charge supervision circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the DC643 charge controller. The BMS accepted the cell without fault, float charge settled at the correct voltage, and the panel cleared its low-battery flag after the conditioning window.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation conditioning on Daitem panels:\u003c\/strong\u003e\n    Do not run a zone or siren test immediately after fitting this cell. Daitem panels sample backup voltage at intervals — if the cell has not yet reached full float charge, the panel logs a low-battery event during the test. Allow 24–48 hours on mains power before triggering any diagnostic test.\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\"\u003eLi-SOCl2 cells ship in a partially passivated state. The internal oxide layer that forms during storage raises cell impedance temporarily, which means the panel's voltage-sampling circuit reads lower than the cell's actual capacity. The DC643 charge supervisor checks backup voltage on a timed cycle — if it samples before the passivation layer has broken down, it logs a low-battery event even on a new cell. Leave the panel on mains power for 24–48 hours and the flag will clear automatically as the cell conditions to float voltage.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eAlarm losing programming during a power outage after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the panel drops its zone and user configuration during a mains failure, the new cell has not yet been accepted by the backup circuit. The DC643 does not switch to battery backup instantly on a fresh cell — it requires a full conditioning cycle on float charge first. A cell installed and then immediately tested by cutting mains power may not deliver enough current to hold panel memory. Restore mains power, wait 48 hours, then test the backup function by removing the mains input briefly — do not cut power for more than 30 seconds on the first test.\u003c\/p\u003e\n\u003c\/div\u003e\n\n---","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43309807992922,"sku":"BWCS-BCT160BT-1","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43309808025690,"sku":"BWCS-BCT160BT-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43309808058458,"sku":"BWCS-BCT160BT-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BCT160BT-1.webp?v=1777868105","url":"https:\/\/batteryweb.com\/products\/daitem-dc643-replacement-battery-108v-6500mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}