{"product_id":"peek-pronto-replacement-battery-37v-750mah-li-ion","title":"Peek Pronto PK-BAT-001 Compatible Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePeek Pronto \/ 9 — 3.7V Li-ion Replacement Battery (PK-BAT-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion cell for the Peek Pronto and Peek 9 messaging devices. Both models share the same battery bay dimensions (41 × 34 × 5mm) and the same OEM part number, PK-BAT-001. If your Pronto or 9 no longer holds a charge, this cell is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePronto and Peek 9 compatibility:\u003c\/strong\u003e\n    Both devices run the same voltage rail and use an identical connector pinout, which is why Peek assigned them a single part number. The BMS handshake requirements are the same across both units, so one cell covers either device without modification.\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 Peek platform, monitoring BMS cutoff at both ends. The protection circuit tripped correctly at the low-voltage floor and accepted charge current without thermal event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this cell, let the device discharge fully to auto-off before charging to 100%. The Peek's fuel gauge IC was calibrated to your old degraded cell — one complete cycle resets the coulomb counter against the new discharge curve and stops erratic percentage readings.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Peek Pronto reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Peek Pronto uses a fuel gauge IC that tracks charge by counting coulombs in and out of the cell. When the original cell degrades, the IC silently adjusts its internal model to match the smaller usable capacity. A new 750mAh cell has a steeper, healthier discharge curve — one the gauge has never seen. Until it runs one full cycle, the IC maps the new cell against the old degraded profile, which causes the percentage readout to jump or stall. One complete discharge-to-auto-off followed by an uninterrupted charge to 100% resets the calibration.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePeek Pronto not powering on after sitting in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells stored in a discharged state can drop below 2.5V per cell, which triggers BMS lockout — a hard protection state that blocks charge current entirely. The device will show no response when plugged in. To recover, connect the charger and leave it undisturbed for 20–40 minutes; most BMS circuits allow a trickle pre-charge at low voltage to bring the cell above the lockout threshold before resuming normal charging. If the device still shows no sign of life after 45 minutes, check that the charger output is at least 5V 500mA at the cable tip.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405096288346,"sku":"BWCS-PEK09SL-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405096321114,"sku":"BWCS-PEK09SL-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405096353882,"sku":"BWCS-PEK09SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-PEK09SL-1.webp?v=1779369970","url":"https:\/\/batteryweb.com\/products\/peek-pronto-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}