{"product_id":"apple-iphone-5-replacement-battery-38v-1400mah-li-polymer","title":"Apple iPhone 5 Replacement Battery 616-0611 3.8V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple iPhone 5 — 3.8V Li-Polymer Replacement Battery (616-0611)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 1400mAh Li-Polymer replacement battery for the Apple iPhone 5. It fits all iPhone 5 variants including MD645LL\/A, MD644LL\/A, and the 64GB model. It replaces OEM part numbers 616-0611, 616-0613, 616-0610, and 616-0612.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eiPhone 5 platform fit:\u003c\/strong\u003e\n    All iPhone 5 variants share the same 3.8V battery bay, connector pinout, and BMS handshake protocol. Any unit listed under the MD644 or MD645 series uses this exact cell format without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on an iPhone 5 mainboard and confirmed the BMS initialised correctly on first boot. The fuel gauge IC accepted the new cell and began coulomb counting without triggering a low-voltage lockout.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After installation, run one full discharge to auto-shutdown and charge uninterrupted to 100% before resuming normal use. This lets the fuel gauge IC map its calibration curve against the new cell before the OS begins reading state-of-charge 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 iPhone 5 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe iPhone 5 uses a coulomb counter inside the fuel gauge IC to track charge state. When you replace the cell, that counter still holds calibration data from the old, degraded battery. The IC will map its old discharge curve onto the new cell, which causes percentage readings to drift — often showing full charge then dropping suddenly. One complete discharge-charge cycle resets the calibration window and brings reported percentage back in line with actual cell voltage.\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 modem or display draws a high instantaneous current and the cell voltage drops sharply below the BMS cutoff threshold — even though the reported percentage looks safe. On the iPhone 5, the combination of LTE radio activity and screen brightness can spike draw enough to cross that cutoff at around 3.5V. The fuel gauge IC hasn't yet learned the new cell's voltage-to-capacity curve, so it doesn't flag the approaching cliff. Run a full calibration cycle first and confirm the shutdown stops occurring before 15% reported charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404347179098,"sku":"BWCS-IPH500SL-1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404347211866,"sku":"BWCS-IPH500SL-2","price":35.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404347244634,"sku":"BWCS-IPH500SL-3","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPH500SL-1.webp?v=1779369805","url":"https:\/\/batteryweb.com\/products\/apple-iphone-5-replacement-battery-38v-1400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}