{"product_id":"samsung-galaxy-s-hercules-replacement-battery-37v-1400mah-li-ion","title":"EB-L1D7IBA Samsung Galaxy S Hercules Replacement Battery 3.7V 1400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSamsung Galaxy S Hercules \/ SGH-T989 — 3.7V Li-ion Replacement Battery (EB-L1D7IBA)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1400mAh Li-ion replacement battery for the Samsung Galaxy S Hercules (SGH-T989), Skyrocket (SGH-I727), and related variants. It uses OEM part number EB-L1D7IBA and slots into the original battery bay without modification. Capacity is 1400mAh — matching the factory spec.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSGH-T989 and SGH-I727 compatibility:\u003c\/strong\u003e\n    Both the Hercules and Skyrocket share the same physical cell footprint, connector pinout, and BMS communication protocol — that is why a single EB-L1D7IBA cell covers both. The fuel gauge IC on each handset reads the same cell ID handshake, so the OS accepts the replacement without warnings.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell on a T989 unit, monitoring BMS charge acceptance and cutoff behaviour through a full discharge-to-full-charge sequence. The protection circuit triggered correctly at both the low-voltage floor and the 4.2V charge ceiling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After installing this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% — without fast charging enabled. This lets the coulomb counter recalibrate its state-of-charge model against the new cell's discharge curve before normal use.\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 SGH-T989 after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Hercules fuel gauge IC stores a discharge curve model calibrated to the old, degraded cell. When a fresh cell arrives with a steeper voltage curve at the low end, the IC's stored model no longer matches reality. The phone thinks it has 25% remaining, but the new cell's open-circuit voltage at that state of charge is lower than the IC expects — it hits the emergency cutoff before the percentage reaches zero. One full uncalibrated cycle (discharge to shutdown, charge to 100% without interruption) rewrites the model. After that cycle, the reported percentage and actual cell voltage align correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone reads 100% immediately after replacement but drops to 60% within minutes\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is the coulomb counter starting from a stale reference point — not a faulty cell. The SGH-T989 charge IC initialises the state-of-charge register based on the last saved value from the old battery, not a fresh open-circuit voltage reading from the new cell. Until the gauge completes a full learning cycle, percentage jumps are normal. Charge the replacement cell to full with the phone off, then power on — this forces the IC to read the resting open-circuit voltage of the new cell and set an accurate starting reference before the first discharge cycle begins.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405061914714,"sku":"BWCS-SMT989SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405061947482,"sku":"BWCS-SMT989SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405061980250,"sku":"BWCS-SMT989SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMT989SL-1.webp?v=1779369899","url":"https:\/\/batteryweb.com\/products\/samsung-galaxy-s-hercules-replacement-battery-37v-1400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}