{"product_id":"moli-mcc1821-replacement-battery-74v-2600mah-li-ion","title":"MOLI MCC1821 Replacement Battery 7.4V 2600mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMOLI MCC1821 \/ MCR-1821 Series — 7.4V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V 2600mAh (19.24Wh) lithium-ion battery for the MOLI MCC1821, MCR-1821, MCR-1821C, and MCR-1821C\/1 portable two-way radios. These units are used in surveying, field operations, and equipment coordination where a dead battery mid-session is not an option. Voltage and cell format match the original pack exactly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMCC1821 and MCR-1821 series compatibility:\u003c\/strong\u003e\n    All listed models share the same 7.4V nominal rail, connector pinout, and BMS handshake protocol. Swapping between MCC and MCR variants does not require any configuration change — the pack negotiates with the radio's charge controller the same way the factory unit does.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through full charge and discharge on the MCC1821 platform, monitoring BMS cutoff thresholds at both the low-voltage floor and the high-voltage ceiling. The protection circuit responded correctly at both endpoints without triggering false over-current trips during normal radio TX bursts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eField deployment prep for surveying operations:\u003c\/strong\u003e\n    After installing this pack, run the radio through at least one full transmit-receive session before heading into the field. The radio's fuel gauge recalibrates its percentage display against the new cell's voltage curve during active use — skipping this step can cause the indicator to show premature low-battery warnings on the first deployment.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MCR-1821 drops off-air mid-transmission after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eDuring a TX keying event, the radio draws a short current spike above idle draw. If the BMS on a new or partially charged pack has not yet settled its internal voltage reference, that spike can read as an over-current condition and trigger a momentary protection cutoff. This is not a faulty pack — it is the BMS being conservative with an unconditioned cell. Running two or three full transmit-receive cycles after installation lets the BMS establish a stable baseline. After that, mid-transmission dropouts from the battery side stop entirely.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically on the display after fitting a new pack\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MCC1821 and MCR-1821 series use a voltage-threshold method to estimate charge level. A new cell's resting voltage profile differs slightly from a used original pack, so the indicator can swing between readings — especially in the upper 80–100% range — until the radio maps the new curve. This is a display calibration issue, not a capacity problem. Charge the new pack to full, then run it down to the point where the radio gives a low-battery alert, then recharge fully. After one complete cycle, the percentage display stabilises to within a few percent of actual state of charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360793100378,"sku":"BWCS-LI1XL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360793133146,"sku":"BWCS-LI1XL-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360793165914,"sku":"BWCS-LI1XL-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LI1XL-1.webp?v=1778616260","url":"https:\/\/batteryweb.com\/products\/moli-mcc1821-replacement-battery-74v-2600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}