{"product_id":"apple-macbook-13-replacement-battery-1095v-5400mah-li-polymer","title":"Apple MacBook 13\" A1331 Replacement Battery 10.95V 5400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple MacBook 13\" Unibody — 10.95V Li-Polymer Replacement Battery (A1331)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.95V, 5400mAh (59.13Wh) lithium-polymer replacement battery for the Apple MacBook 13\" and MacBook Unibody 13\". It replaces OEM part numbers A1331, A1342, 661-5391, 020-6580-A, 020-6582-A, 020-6809-A, and 020-6810-A. Install it when the original cell no longer holds a useful charge or the laptop shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMacBook Unibody 13\" platform fit:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The A1331 cell communicates charge state over a dedicated SMBus line — swapping to an incompatible cell will trigger an immediate system fault and prevent charging.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a MacBook Unibody 13\" and monitored SMBus communication throughout. The BMS negotiated charge termination cleanly at 10.95V and current tapered correctly as the cell approached capacity with no fault codes logged.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting this battery, run the MacBook down to automatic hibernate — do not force-quit — then charge uninterrupted to 100% without disconnecting the MagSafe. This completes one full learn cycle and resets the BIOS battery gauge against the new cell's actual capacity.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003emacOS reporting battery health as \"Replace Now\" straight after installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MacBook reads battery health from EEPROM data stored on the cell's BMS board. A new cell ships with a fresh EEPROM state, but the Mac's System Management Controller still holds cycle count and state-of-health data from the old battery. Until the SMC re-evaluates the new cell over one or two full charge cycles, the health status in System Information will appear inaccurate or alarming. Reset the SMC by shutting down, holding Shift-Control-Option plus the power button for ten seconds, then run at least one full discharge-to-hibernate and full recharge cycle. Health reporting should normalise at that point.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMacBook shuts off at 20–30% charge shown on the menu bar\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The old calibration data maps a voltage reading that previously corresponded to empty onto the new cell incorrectly, so the system triggers a low-voltage shutdown before the actual remaining capacity is exhausted. The fix is two to three full discharge-to-hibernate cycles with uninterrupted charges to 100% each time — this forces the fuel gauge IC to build a new discharge profile. After the third cycle, the displayed percentage should track actual cell voltage accurately down to the hardware cutoff near 9.5V.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409790369882,"sku":"BWCS-AM1342NB-1","price":113.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409790402650,"sku":"BWCS-AM1342NB-2","price":129.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409790435418,"sku":"BWCS-AM1342NB-3","price":141.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AM1342NB-1.webp?v=1779580870","url":"https:\/\/batteryweb.com\/products\/apple-macbook-13-replacement-battery-1095v-5400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}