{"product_id":"kyocera-kx13-replacement-battery-37v-750mah-li-ion","title":"Kyocera KX13 Replacement Battery TXBAT10099 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKyocera KX13 \/ KX16 \/ KX160 — 3.7V Li-ion Replacement Battery (TXBAT10099)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion replacement battery for the Kyocera KX13, KX16, KX160, and KX12 flip phones. It uses OEM part number TXBAT10099 and measures 54.00 × 36.20 × 6.20mm — a direct physical match for the original cell slot. Capacity is rated at 2.78Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKX-series flip phone compatibility:\u003c\/strong\u003e\n    The KX13, KX16, KX160, and KX12 share the same battery bay dimensions, 3.7V single-cell architecture, and connector pinout — all four models accept the TXBAT10099 cell without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a KX160 unit and confirmed the BMS accepted charge handshake correctly, held stable voltage through a full discharge curve, and did not trigger low-voltage cutoff prematurely.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge to automatic shutoff, then charge uninterrupted to 100% before normal use. The KX-series fuel gauge IC calibrates its coulomb counter against the first full discharge curve — skipping this causes the percentage readout to drift immediately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the KX13 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe KX-series fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The gauge reads voltage against the old map and outputs a percentage that drifts — often showing 80% when the phone is close to shutoff. One full discharge-to-shutoff cycle followed by an uninterrupted charge forces the IC to rebuild its reference curve against the new cell and restores accurate readings.\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 happens when the cell voltage drops below the modem's minimum operating threshold under transmit load — even though the gauge still shows charge remaining. The KX13's GSM radio pulls current in bursts during a call; if internal cell resistance is slightly elevated on a new cell, voltage sags briefly below 3.2V and the phone cuts out. The fix is to complete two full discharge-charge cycles first, which conditions the cell and lets the BMS confirm the actual low-voltage floor before the phone relies on it under peak current draw.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405147865178,"sku":"BWCS-KYK160SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405147897946,"sku":"BWCS-KYK160SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405147930714,"sku":"BWCS-KYK160SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KYK160SL-1.webp?v=1779370298","url":"https:\/\/batteryweb.com\/products\/kyocera-kx13-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}