{"product_id":"pharos-ptl535-replacement-battery-37v-1250mah-li-ion","title":"Pharos PTL535 PDA Replacement Battery 3.7V 1250mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePharos PTL535 Series — 3.7V Li-ion Replacement Battery (PZX65)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1250mAh Li-ion cell replaces the original PZX65 battery in Pharos PTL535, PTL535x, and PTL535e pocket PCs. The PTL535 line is a handheld PDA platform used for scheduling, contacts, and mobile data tasks. Swap this cell when the original no longer holds a charge or fails to power the device through a full session.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePTL535 platform compatibility:\u003c\/strong\u003e\n    The PTL535, PTL535x, and PTL535e share the same battery bay geometry and connector pinout. All three accept the PZX65 cell and use the same BMS communication protocol, so no firmware or hardware modification is needed.\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 PTL535 platform. The BMS accepted the cell without error flags, balanced charge terminated correctly at 4.2V, and the device completed full boot without voltage sag triggering a low-power cutoff.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePre-swap sync requirement:\u003c\/strong\u003e\n    Perform a full ActiveSync or Windows Mobile Device Center sync to your host computer before removing the battery. The PTL535 stores open application state and unsaved data in volatile RAM powered directly by this cell — cutting power without syncing will wipe that data.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the PTL535 won't boot after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA freshly shipped Li-ion cell typically arrives at 30–50% charge — below the minimum voltage the PTL535 boot sequence needs to complete. The device will appear dead or loop back to a blank screen. Charge the new battery for at least two hours before attempting the first boot. Do not interpret a blank screen at first insertion as a faulty cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePTL535 showing low battery within hours of a full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the battery indicator drops quickly after a full charge, the most common cause is a calibration mismatch — the device's fuel gauge is still reading against the degraded capacity curve of the old cell. Run the PTL535 down to auto-shutoff, then charge uninterrupted to 100% to force a gauge recalibration. If the problem persists after two full cycles, check that the dock or USB charge cable is delivering stable current — intermittent charge connections reset the cycle mid-session and prevent the BMS from logging a complete charge event.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415947149402,"sku":"BWCS-FL420SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415947182170,"sku":"BWCS-FL420SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415947214938,"sku":"BWCS-FL420SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FL420SL-1.webp?v=1779758396","url":"https:\/\/batteryweb.com\/products\/pharos-ptl535-replacement-battery-37v-1250mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}