{"product_id":"qtek-9100-replacement-battery-37v-2800mah-li-ion","title":"Qtek 9100 WIZA16 Replacement Battery 3.7V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eQtek 9100 — 3.7V Li-ion Replacement Battery (WIZA16)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2800mAh Li-ion battery is a direct cell replacement for the Qtek 9100 Windows Mobile smartphone. It matches the OEM voltage rail and physical footprint — 51.86 x 38.97 x 12.48mm — so it seats correctly in the battery bay. Capacity listed here comes from the product data, not a third-party estimate.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQtek 9100 platform fit:\u003c\/strong\u003e\n    The 9100 shares its battery bay and connector with select HTC Windows Mobile handsets from the same era. OEM cross-references WIZA16, 35H00062-00M, and HTC098347 all map to the same cell specification, same connector pinout, and same BMS handshake requirement.\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 9100 platform. The BMS accepted the charge IC handshake without fault codes, and the cell voltage held above 3.5V under screen-on and radio-active load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after installation:\u003c\/strong\u003e\n    On first use, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before using the device. This gives the fuel gauge IC a full reference curve against the new cell — without it, percentage readings will drift immediately after installation.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Qtek 9100 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 9100 uses a coulomb-counting fuel gauge IC that builds its charge model from accumulated cycle data stored against the original cell. When a new cell goes in, that stored model no longer matches the actual discharge curve of the replacement. The gauge reads percentage against the old curve, so it can show 40% while the cell is already near cutoff voltage. One full discharge-charge cycle — letting the device shut down naturally, then charging to 100% uninterrupted — forces the IC to reset its reference points. After that cycle, percentage accuracy stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff failure, not a capacity problem. When the modem transmits or the screen brightness peaks, current draw spikes sharply. If the cell voltage cannot hold above the BMS cutoff threshold — typically 3.0V under load — the BMS trips and the phone cuts out instantly, even though the gauge still shows charge remaining. A new cell that has not completed its first full calibration cycle is especially prone to this because the gauge is feeding the BMS inaccurate state-of-charge data. Run that first full discharge cycle, confirm the cell reaches at least 4.1V at full charge, and the shutdowns will stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405261733978,"sku":"BWCS-WIZA16HL-1","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405261766746,"sku":"BWCS-WIZA16HL-2","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405261799514,"sku":"BWCS-WIZA16HL-3","price":42.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WIZA16HL-1.webp?v=1779370368","url":"https:\/\/batteryweb.com\/products\/qtek-9100-replacement-battery-37v-2800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}