{"product_id":"t-mobile-catalyst-3622a-replacement-battery-37v-2200mah-li-polymer","title":"T-Mobile Catalyst 3622A CPLD-390 Compatible Battery 3.7V 2200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Catalyst 3622A — 3.7V Li-Polymer Replacement Battery (CPLD-390)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2200mAh Li-Polymer cell replaces the original CPLD-390 battery in the T-Mobile Catalyst 3622A. It fits the candybar-style handset and restores power for calls, messaging, and basic app use. Capacity is rated at 8.14Wh — identical to the factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCatalyst 3622A fit:\u003c\/strong\u003e\n    This cell matches the 3622A's connector pinout, physical footprint (71.00 × 52.98 × 5.00mm), and 3.7V nominal rail. The BMS communicates charge state over the same two-wire interface the original uses, so the phone's charge IC accepts it without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled the cell through charge and discharge on the 3622A platform. The BMS held thermal cutoff within spec and the charge IC completed a full cycle without faulting or dropping into trickle mode early.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use, disable any fast-charge setting and run one full discharge-to-charge cycle before normal operation. This lets the fuel gauge IC build an accurate discharge curve against the new cell — skipping this step is the main cause of erratic percentage readings after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Catalyst 3622A reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe phone's fuel gauge IC stores a learned discharge curve calibrated to the old cell. When a new cell goes in, that stored curve no longer matches actual cell chemistry. The IC reads voltage and estimates capacity against wrong reference data, so the percentage display drifts. One full discharge from 100% down to automatic shutoff — then a complete charge to 100% — forces the coulomb counter to reset and relearn the new cell's curve. After that cycle, percentage accuracy returns to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under modem or display load before the fuel gauge registers a low reading — a voltage cliff the OS doesn't catch in time. The phone shuts down to protect the cell, even though the percentage shown looks safe. The root cause is the uncalibrated fuel gauge overestimating remaining capacity at mid-range. Run the recalibration cycle described above; if shutdowns continue after two full cycles, check that the replacement cell seated flush with no bent connector pins. After recalibration the cutoff threshold should track to 3.4V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392026050650,"sku":"BWCS-TMC362SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392026083418,"sku":"BWCS-TMC362SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392026116186,"sku":"BWCS-TMC362SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-TMC362SL-1.webp?v=1779142963","url":"https:\/\/batteryweb.com\/products\/t-mobile-catalyst-3622a-replacement-battery-37v-2200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}