{"product_id":"rover-p4-replacement-battery-37v-2400mah-li-ion","title":"Rover P4 PDA Replacement Battery 3.7V 2400mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRover P4 — 3.7V Li-ion Replacement Battery (BP8CULXBIAP1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 2400mAh Li-ion cell replaces the original battery in the Rover P4 handheld PDA. The P4 is a mid-2000s pocket PC used for scheduling, contact management, and document viewing. This battery restores full power to units still in daily service.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRover P4 platform fit:\u003c\/strong\u003e\n    The P4 runs on a single-cell 3.7V Li-ion supply with a BMS handshake that monitors cell voltage and temperature. This replacement cell matches the connector pinout and voltage profile the P4's power management IC expects — no negotiation issues on startup.\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. The BMS held cutoff at the correct low-voltage threshold and the charge circuit accepted the cell without triggering fault flags on reconnection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-swap sync requirement:\u003c\/strong\u003e\n    Perform a full ActiveSync or data sync to the host computer before removing the battery. The P4 holds open application state and unsaved data in RAM powered directly by the main battery — cutting power without syncing first will wipe anything not written to flash.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Rover P4 loses all data when the battery dies completely\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe P4 stores active RAM contents — open files, app state, recent entries — using power from the main battery, not a separate backup cell. When voltage drops below the BMS cutoff, the RAM loses power and that data is gone instantly. This is not a fault with the replacement cell. The fix is to sync before the battery is fully depleted or before any swap. If the unit arrives with a dead battery, connect it to the charger before powering it on — a partial charge is enough to attempt a sync.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eRover P4 not booting after new battery installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly fitted cell may sit below the minimum voltage the P4's boot sequence requires, especially after storage. The device will appear dead — no screen, no response to the power button. Connect the P4 to its charger and leave it for at least 20–30 minutes before attempting a boot. Once the cell reaches approximately 3.5V, the power management IC will allow the boot sequence to proceed normally.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415949443162,"sku":"BWCS-MIO339XL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415949475930,"sku":"BWCS-MIO339XL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415949508698,"sku":"BWCS-MIO339XL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MIO339XL-1.webp?v=1779758397","url":"https:\/\/batteryweb.com\/products\/rover-p4-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}