{"product_id":"kyocera-hydro-air-replacement-battery-38v-2100mah-li-ion","title":"Kyocera Hydro Air SCP-64LBPS Replacement Battery 3.8V 2100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKyocera Hydro Air \/ Hydro Wave — 3.8V Li-ion Replacement Battery (SCP-64LBPS)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V Li-ion cell rated at 2100mAh (7.98Wh), built to the same form factor as the original SCP-64LBPS. It fits the Kyocera Hydro Air, Hydro Wave, C6745, and C6745 LTE. Physical dimensions are 64.90 × 50.40 × 5.50mm — same as the OEM cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHydro Air and Hydro Wave compatibility:\u003c\/strong\u003e\n    Both handsets run the same battery bay geometry, connector pinout, and BMS handshake protocol. Swapping between these models uses the same cell — the voltage rail and NTC thermistor wiring are identical across the C6745 platform.\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 C6745 platform. The BMS accepted the cell without a handshake fault, thermal cutoff triggered correctly at elevated temperature, and the charge IC ramped to full current within the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. The fuel gauge IC on the Hydro Air is calibrated to the old cell's discharge curve — one slow cycle lets it map the new cell before resuming high-current charging.\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 Hydro Air after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Hydro Air's fuel gauge IC holds a discharge curve from the old cell. When a new cell goes in, the stored curve no longer matches actual cell voltage under load. The modem radio and display together draw enough current to cause a voltage cliff — the cell voltage drops sharply under that load even when the coulomb counter still reads 20–30%. One full discharge-charge cycle at standard rate forces the fuel gauge IC to relearn the new cell's voltage-versus-capacity curve and eliminates these premature shutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone stays at a fixed percentage for long stretches then drops fast\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is the fuel gauge IC recalibrating in real time against a cell it has not yet profiled. The coulomb counter is estimating state-of-charge from current flow, but without an accurate open-circuit voltage reference for the new cell, it plateaus then corrects sharply when voltage actually changes. It is not a fault in the replacement cell. Discharge the phone fully until it shuts off, then charge uninterrupted to 100% — after that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392094765146,"sku":"BWCS-KYC745SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392094797914,"sku":"BWCS-KYC745SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392094830682,"sku":"BWCS-KYC745SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KYC745SL-1.webp?v=1779143748","url":"https:\/\/batteryweb.com\/products\/kyocera-hydro-air-replacement-battery-38v-2100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}