{"product_id":"t-mobile-sidekick-3-replacement-battery-37v-1600mah-li-ion","title":"T-Mobile Sidekick 3 PV-BL11 Replacement Battery 3.7V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Sidekick 3 — 3.7V Li-ion Replacement Battery (PV-BL11)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1600mAh Li-ion battery replaces the PV-BL11 and EA-BL12 cells in the T-Mobile Sidekick 3, Sidekick III, D-Wade Edition, and Sidekick iD. It fits the original battery compartment and connector without modification. Capacity matches the factory spec at 5.92Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSidekick 3 and iD platform fit:\u003c\/strong\u003e\n    These models share the same 3.7V single-cell architecture, connector footprint, and BMS handshake, so one cell covers the full lineup. The PV-BL11 and EA-BL12 are interchangeable OEM references for the same physical cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a Sidekick 3 unit and confirmed the BMS communicated charge state correctly through full discharge and recharge. No cutoff errors or false full-charge flags appeared during testing.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable any fast-charge accessory and run one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate its discharge curve against the new cell before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Sidekick 3 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Sidekick 3 uses a fuel gauge IC that tracks capacity based on a learned discharge curve from the old cell. When you install a new cell, the IC still references that old curve, so the percentage displayed drifts from the actual charge state. This mismatch gets worse mid-charge and can show full at 80% or show 40% when the cell is nearly empty. One full discharge down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the IC to rewrite its reference curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the Sidekick 3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under the combined load of the backlit keyboard, screen, and radio transmit burst — a voltage cliff the fuel gauge IC failed to anticipate. At that load spike, cell voltage can fall below the BMS cutoff threshold even though the displayed percentage looks safe. It is not a faulty battery — it is the fuel gauge IC working from a stale calibration. Run one full discharge-charge cycle; after recalibration, the IC will flag low battery before voltage hits the cutoff floor, typically at 3.4V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405152354394,"sku":"BWCS-BL12SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405152387162,"sku":"BWCS-BL12SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405152419930,"sku":"BWCS-BL12SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BL12SL-1.webp?v=1779370297","url":"https:\/\/batteryweb.com\/products\/t-mobile-sidekick-3-replacement-battery-37v-1600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}