{"product_id":"tizi-eq20644-replacement-battery-37v-1050mah-li-ion","title":"Tizi EQ20644 Replacement Battery 3.7V 1050mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTizi EQ20644 — 3.7V Li-ion 1050mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 1050mAh (3.89Wh), built to fit the Tizi EQ20644 smartphone. It replaces the original cell when capacity has dropped and the phone no longer holds a usable charge. Physical dimensions are 53.00 × 33.90 × 5.60mm — verify these against your original cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEQ20644 fit confirmation:\u003c\/strong\u003e\n    The EQ20644 runs a standard 3.7V single-cell architecture. This replacement matches the voltage rail and connector pinout required by that platform. No adapter or modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the bench and monitored BMS behaviour throughout. The protection circuit responded correctly at both low-voltage cutoff and charge termination — no false trips observed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before any high-current session pushes charge into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the EQ20644 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity defect. When the modem transmits or the screen peaks in brightness, current draw spikes sharply. An uncalibrated fuel gauge IC reads the resulting voltage sag as a hard cutoff and shuts the phone down — even though percentage still shows 20–30%. Running one full discharge cycle to 0% and a full charge back to 100% at standard rate recalibrates the coulomb counter. After that cycle, the reported percentage tracks actual cell state accurately under load.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eEQ20644 not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge during storage. If the cell dropped below approximately 2.5V, the BMS enters a lockout state and blocks normal charging to prevent damage to an over-discharged cell. The phone will not respond to a standard charger in this state. Connect the device to a charger and leave it undisturbed for 15–30 minutes — most charge ICs will trickle current into the cell at a reduced rate to bring voltage back above the BMS recovery threshold, typically around 2.9–3.0V, before resuming normal charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405111853146,"sku":"BWCS-HFC250SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405111885914,"sku":"BWCS-HFC250SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405111918682,"sku":"BWCS-HFC250SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HFC250SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/tizi-eq20644-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}