{"product_id":"msi-wt75-8sm-028ca-replacement-battery-144v-5100mah-li-ion","title":"MSI WT75 8SM Replacement Battery 14.4V 5100mAh BTY-L78","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMSI WT75 8SM-028CA \/ GT75 Series — 14.4V Li-ion Replacement Battery (BTY-L78)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 14.4V 5100mAh (73.44Wh) Li-ion replacement battery carrying OEM part number BTY-L78. It fits the MSI WT75 8SM-028CA mobile workstation along with the GT75 8RF, GT73VR 7RE-298, GT75VR 7RF-033, and over 238 additional MSI configurations. If the original cell no longer holds charge or BIOS flags battery health as degraded, this is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWT75 and GT-series platform compatibility:\u003c\/strong\u003e\n    These MSI models share the same 14.4V power rail, BTY-L78 connector pinout, and BMS handshake protocol — which is why a single cell covers the full platform. The BMS communicates remaining capacity and temperature data back to the EC over the same SMBus line across all affected SKUs.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, full-load discharge, and BMS trip recovery on a WT75 chassis. The protection circuit responded correctly to over-voltage and thermal thresholds, and the EC recognised the cell without firmware errors.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on MSI EC firmware:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. MSI's embedded controller runs a battery learn cycle against stored EEPROM data — skipping this step leaves BIOS reporting inaccurate health and capacity figures from the old cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the WT75 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff failure, not a defective cell. Under combined CPU, GPU, and display load, the new cell's voltage drops faster than the fuel gauge IC expects based on EEPROM data from the previous battery. The EC interprets that voltage drop as an empty cell and triggers an immediate shutdown. Running two to three full discharge-to-charge cycles recalibrates the fuel gauge IC against the actual discharge curve of the new chemistry, and the premature shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting BTY-L78 replacement as \"poor health\" or unknown Wh rating\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMSI's BIOS reads battery identity and rated Wh from EEPROM data embedded in the cell. A new cell arrives with its own EEPROM values, which can conflict with the health baseline the EC stored from the original battery. This shows up as a health warning or an incorrect Wh figure in BIOS and Windows battery settings — it does not mean the cell is faulty. Perform the full discharge-to-100% learn cycle; the EC rewrites its reference data and the warning clears. If the Wh figure still differs slightly from 73.44Wh in the OS, verify BIOS is on the latest MSI firmware build for the WT75 platform.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409675354202,"sku":"BWCS-MST800NB-1","price":87.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409675386970,"sku":"BWCS-MST800NB-2","price":102.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409675419738,"sku":"BWCS-MST800NB-3","price":113.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MST800NB-1.webp?v=1779580430","url":"https:\/\/batteryweb.com\/products\/msi-wt75-8sm-028ca-replacement-battery-144v-5100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}