{"product_id":"zenner-c5-iuf-replacement-battery-36v-2450mah-li-socl2","title":"Zenner C5-IUF Water Meter Replacement Battery 3.6V 2450mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eZenner C5-IUF \/ Zelsius Heat Meter — 3.6V Li-SOCl2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V lithium-thionyl chloride cell replaces the factory battery in the Zenner C5-IUF water meter and Zelsius heat meter. It delivers 2450mAh at 8.82Wh to sustain data logging, pulse counting, and automated meter reading transmission. Li-SOCl2 chemistry is the correct type for these meters — do not substitute a lithium-ion cell, even at the same voltage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC5-IUF and Zelsius compatibility:\u003c\/strong\u003e\n    Both meters share the same battery bay dimensions and draw profile. The C5-IUF logs consumption pulses continuously; the Zelsius adds heat energy calculations. Both run from a single Li-SOCl2 cell at 3.6V with near-zero standby current between transmissions — exactly the operating condition this chemistry handles well.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell under simulated AMR transmission bursts and confirmed stable voltage delivery through each pulse event. The cell held above 3.5V throughout sustained logging cycles with no dropout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install initialisation on the C5-IUF:\u003c\/strong\u003e\n    After fitting the new cell, navigate to the meter's diagnostic or service menu and trigger a manual readout cycle before resealing the housing. The meter re-establishes its internal clock and logging baseline at this point — skipping it can cause the first transmitted read to carry a timestamp error or register as a gap in the AMR record.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the C5-IUF stops transmitting data after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells exhibit a voltage passivation layer that forms during storage. When a fresh cell is first loaded into the meter, this layer briefly suppresses output voltage on the initial transmission burst. The C5-IUF's radio module requires a clean voltage pulse to complete an AMR handshake — if the cell is passivated, the pulse drops short and the meter logs a failed transmission. Most cells recover within one or two natural transmission cycles, but if the meter has a manual trigger option, using it once immediately after installation clears the passivation layer faster.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMeter display showing a depleted battery warning immediately after fitting a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the meter's internal voltage threshold check runs before the passivation layer clears — the cell reads low at the instant of power-up, and the meter logs a low-battery flag against it. It is not a fault with the cell. Trigger one manual readout cycle so the meter samples voltage under a real transmission load. If the cell is healthy, the warning clears and does not return. Confirm the cell is reading at or above 3.5V during the cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306860380250,"sku":"BWCS-ZNM500SL-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306860413018,"sku":"BWCS-ZNM500SL-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306860445786,"sku":"BWCS-ZNM500SL-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZNM500SL_1.webp?v=1777768792","url":"https:\/\/batteryweb.com\/products\/zenner-c5-iuf-replacement-battery-36v-2450mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}