{"product_id":"blu-tank-45-replacement-battery-38v-1550mah-li-ion","title":"BLU Tank 4.5 Replacement Battery 3.8V 1550mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eBLU Tank 4.5 — 3.8V Li-ion 1550mAh Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V Li-ion battery rated at 1550mAh (5.89Wh) for the BLU Tank 4.5 smartphone. It replaces the original cell when the phone no longer holds a charge through a normal day of use. The physical footprint is 51.40 x 51.00 x 5.50mm — measure your current cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTank 4.5 fit:\u003c\/strong\u003e\n    The Tank 4.5 uses a removable back panel with a swappable cell — no heat gun or adhesive required. The connector orientation and tab placement on this cell match the original dock point inside the battery bay.\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 a Tank 4.5 unit. The BMS accepted charging current without flagging an error, and the fuel gauge IC began tracking state-of-charge correctly after one full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    On first use, disable any power-saving fast-charge modes and run one complete discharge down to auto-shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one clean reference cycle against the new cell's actual discharge curve before the OS starts using that data for percentage reporting.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Tank 4.5 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Tank 4.5 uses a fuel gauge IC that builds its state-of-charge model from previous discharge cycles stored in memory. When you swap in a new cell, that stored model no longer matches the new cell's voltage-to-capacity curve. The phone reads voltage and maps it against the old curve, so the percentage shown can be off by 10–20% — especially in the 30–60% range. One full uninterrupted discharge-to-shutdown followed by a full charge to 100% resets the coulomb counter reference and brings the percentage reporting back into line.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops below what the modem and display load require, even though the fuel gauge is still showing charge remaining. A new Li-ion cell can have a steeper voltage cliff under high-current draw until it has been broken in through a few cycles. The BMS trips to protect the cell before the OS registers a low-battery warning. If this occurs, charge to 100% and repeat two full discharge cycles — by the third cycle the voltage sag under load typically stabilises above the 3.4V cutoff threshold.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404258115674,"sku":"BWCS-KTU900SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404258148442,"sku":"BWCS-KTU900SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404258181210,"sku":"BWCS-KTU900SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-KTU900SL-1.webp?v=1779369512","url":"https:\/\/batteryweb.com\/products\/blu-tank-45-replacement-battery-38v-1550mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}