{"product_id":"asus-mypal-a620-replacement-battery-37v-2200mah-li-ion","title":"Asus Mypal A620 Replacement Battery 3.7V 2200mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAsus MyPal A620 Series — 3.7V Li-ion Replacement Battery (029521-83159-7)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V Li-ion cell replaces the original battery in the Asus MyPal A620, A620BT, and A620G Pocket PC handhelds. Rated at 2200mAh (8.14Wh), it restores portable operation to these early-2000s PDA devices. Dimensions are 67.89 × 52.40 × 5.52mm — measure your original before ordering if unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA620, A620BT, and A620G compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. The BT and G variants add Bluetooth and GPS radios respectively, but neither changes the battery interface or BMS handshake.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on the A620 platform and confirmed the BMS initialised correctly on first charge. The protection circuit tripped as expected at the low-voltage threshold before cell voltage dropped below safe limits.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eRAM power before removal:\u003c\/strong\u003e\n    Sync all open data to a host PC before pulling the battery. The MyPal A620 stores active application state and unsaved data in SRAM powered directly by the main cell — cutting power without syncing first will wipe anything not written to flash storage.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the MyPal A620 loses calendar entries and contacts after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe A620 runs Windows Mobile on top of a RAM-dependent architecture. Unlike modern devices with NAND flash as the primary data store, the MyPal keeps the active database — contacts, calendar, tasks — in volatile SRAM. That RAM needs continuous voltage to hold its contents. Even a brief gap between removing the old cell and seating the new one is enough to wipe it. A backup battery or capacitor is not present on this board to bridge the gap. Always perform an ActiveSync backup to a PC before swapping the cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew battery seated but the A620 won't complete the boot sequence\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly shipped Li-ion cell is typically stored at around 30–50% state of charge. The MyPal A620 boot ROM checks supply voltage early in the startup sequence and will halt if the reading falls below its minimum threshold. Pressing the power button on a partially charged new battery can cause it to stall at the boot screen or immediately shut off. Connect the device to the AC adapter and charge the new cell to at least 3.9V before attempting the first boot.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415953834074,"sku":"BWCS-A620XL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415953866842,"sku":"BWCS-A620XL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415953899610,"sku":"BWCS-A620XL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-A620XL-1.webp?v=1779758424","url":"https:\/\/batteryweb.com\/products\/asus-mypal-a620-replacement-battery-37v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}