{"product_id":"blu-d550-replacement-battery-37v-2200mah-li-ion","title":"BLU D550 Replacement Battery 3.7V 2200mAh C766205220T","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU D550 \/ Studio 5.3 Series — 3.7V Li-ion Replacement Battery (C766205220T)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2200mAh Li-ion replacement battery for the BLU D550, D550A, D551A, and Studio 5.3 smartphones. It replaces OEM part C766205220T. Swap it in when the original cell no longer holds a charge or the phone shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eD550 \/ Studio 5.3 platform compatibility:\u003c\/strong\u003e\n    The D550, D550A, D551A, and Studio 5.3 share the same battery bay dimensions, connector pinout, and BMS handshake requirements. All four accept the C766205220T cell format at 3.7V nominal.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through a full charge-discharge cycle on a D550 unit. The BMS accepted the cell without fault codes, charge termination triggered correctly at 4.2V, and low-voltage cutoff engaged at the expected threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. This lets the fuel gauge IC build an accurate discharge curve map against the new cell before high-current charging begins pushing 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\"\u003eSudden shutdown at 20–30% on the D550 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe BLU D550's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has a different internal resistance profile, so the IC misreads remaining capacity. When the modem fires a high-current burst — during a call or LTE data load — the cell voltage drops sharply below what the IC expects at that reported percentage. The phone interprets this as a critically low voltage event and shuts down even though the gauge still shows 20–30%. One full uninterrupted discharge to automatic shutdown followed by a full charge cycle resets the coulomb counter against the new cell curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reports wrong battery percentage after installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the D550 uses a stored model of the old cell's capacity curve to calculate percentage. A replacement cell with a different impedance signature throws off that model immediately. You'll see the percentage jump erratically or read higher than actual charge state. Run one complete discharge from 100% to automatic shutoff, then charge uninterrupted to 100% — this forces the IC to relearn the new cell's curve and stabilise the readout.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404236882010,"sku":"BWCS-BLU510SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404236914778,"sku":"BWCS-BLU510SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404236947546,"sku":"BWCS-BLU510SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BLU510SL-1.webp?v=1779369448","url":"https:\/\/batteryweb.com\/products\/blu-d550-replacement-battery-37v-2200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}