{"product_id":"i-mate-k-jam-replacement-battery-37v-2350mah-li-ion","title":"I-Mate K-Jam Compatible Battery WIZA16 3.7V 2350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eI-Mate K-Jam — 3.7V Li-ion Replacement Battery (WIZA16)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 2350mAh (8.7Wh), built to replace the original WIZA16 battery in the I-Mate K-Jam. The K-Jam is a Windows Mobile PDA phone from the mid-2000s, combining voice calling, messaging, and pocket computing in a single device. When the original cell degrades and can no longer hold charge through a full day of use, this battery swaps in at the same voltage and connector footprint.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK-Jam platform fit:\u003c\/strong\u003e\n    The K-Jam shares its battery bay and connector pinout with the WIZA16 spec — the same voltage rail and physical footprint that the device's charge IC expects. No modification needed at the hardware level.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the K-Jam platform. The BMS handshake with the device's charge circuit completed correctly, and no over-voltage or over-current faults were triggered during the charge phase.\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-charge cycle before enabling any fast-charge option. This lets the K-Jam's fuel gauge IC map its readings against the new cell's actual discharge curve, so percentage reporting is accurate from the second cycle onward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the K-Jam reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe K-Jam uses a fuel gauge IC that builds its percentage model against the discharge curve of the cell it was last calibrated to. Swap in a new cell and that learned curve no longer matches what is physically installed. The gauge will report stale data — often showing higher or lower percentages than the real state of charge. One full discharge from 100% down to automatic shutdown, followed by a full charge without interruption, forces the IC to relearn against the new cell. After that cycle, readings stabilise.\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 K-Jam's screen backlight, radio, and processor pull current simultaneously and the cell voltage drops below the BMS cutoff threshold before the gauge reads zero. It is a voltage-cliff issue, not a capacity fault — the cell has energy remaining but cannot sustain voltage under combined load. The fix is completing at least one full calibration cycle so the fuel gauge adjusts its low-battery warning threshold to match the new cell's voltage curve. After calibration, the device should shut down closer to 5–8% rather than cutting off at an artificially high reading.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405259964506,"sku":"BWCS-WIZA16XL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405259997274,"sku":"BWCS-WIZA16XL-2","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405260030042,"sku":"BWCS-WIZA16XL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-WIZA16XL-1.webp?v=1779370368","url":"https:\/\/batteryweb.com\/products\/i-mate-k-jam-replacement-battery-37v-2350mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}