{"product_id":"dallab-dp900-replacement-battery-37v-1200mah-li-ion","title":"DALLAB DP900 Replacement Battery 3.7V 1200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDALLAB DP900 \/ xg 500p — 3.7V Li-ion Replacement Battery (GB\/T18287-2000)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1200mAh lithium-ion battery replaces the original cell in the DALLAB DP900 and xg 500p handheld PDAs. These Pocket PC devices lose battery capacity over time through normal charge cycling, and this unit restores full operating voltage to the platform. Capacity is 1200mAh (4.44Wh) as rated in the product specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDP900 and xg 500p platform fit:\u003c\/strong\u003e\n    Both models share the same 3.7V single-cell Li-ion architecture and connector footprint, so one replacement cell covers both units. The BMS threshold and charge termination voltage match the original charging circuit in each device.\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 and confirmed the BMS terminates correctly at 4.2V, with undervoltage cutoff activating at approximately 3.0V to protect cell integrity.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eRAM data protection before swap:\u003c\/strong\u003e\n    Perform a full ActiveSync or data sync to the host PC before removing the old battery. The DP900 holds open application state and unsaved data in volatile SRAM powered directly by the main battery — cutting power without syncing first wipes that data instantly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the DP900 fails to boot after a new battery is installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DP900 boot sequence requires a minimum cell voltage before the processor will initialise. A new replacement battery shipped in storage state often sits at 3.3V or below — below the threshold the device needs to start the boot loader. If the unit shows nothing on screen after swapping the cell, connect the OEM charger and let the battery reach at least 3.6V before attempting to power on. Do not hold the power button repeatedly — the device simply will not boot at low voltage regardless of button input.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWireless sync dropping or failing after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe DP900's Wi-Fi or Bluetooth radio draws a sharp current spike when it initialises, which a partially charged cell may not sustain without a voltage sag that causes the radio to drop. Users see this as a failed or incomplete ActiveSync session immediately after fitting a new battery. Charge the replacement cell fully to 4.2V on the charger before attempting wireless sync. If the radio still drops, check that the host PC's sync software is not timing out — the DP900 radio stack can take longer to re-associate after a full power cycle.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415944036442,"sku":"BWCS-ET280SL-1","price":27.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43415944069210,"sku":"BWCS-ET280SL-2","price":31.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43415944101978,"sku":"BWCS-ET280SL-3","price":34.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ET280SL-big.webp?v=1779758396","url":"https:\/\/batteryweb.com\/products\/dallab-dp900-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}