Samsung Skyrocket EB-L1D7IBA Replacement Battery 3.7V 2800mAh

Samsung Skyrocket SGH-I727 — 3.7V Li-ion Replacement Battery (EB-L1D7IBA)

This 3.7V, 2800mAh Li-ion cell replaces the OEM battery in the Samsung Skyrocket (SGH-I727). It uses the same connector and matches the physical footprint at 56.40 × 50.80 × 11.00mm. Drop it in when the original cell no longer holds enough charge to get through normal use.

• Skyrocket and SGH-I727 fit: Both model names refer to the same AT&T LTE device. The battery bay, connector pin-out, and BMS communication protocol are identical across both designations — one cell covers both.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SGH-I727. The BMS accepted the cell without triggering a protection fault, and the charge IC negotiated correctly with the phone's onboard power management.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. The SGH-I727's fuel gauge IC is calibrated to the old cell's discharge curve. Giving it one unconstrained cycle against the new cell prevents the coulomb counter from mis-reading state-of-charge from day one.

Sudden shutdown at 20–30% on the Skyrocket after a cell swap

The SGH-I727 modem and screen pull significant current spikes. A fresh cell with a slightly different internal resistance curve can cause voltage to sag below the BMS cutoff threshold before the fuel gauge reads zero. The phone interprets this as a hard fault and shuts down even though the reported percentage is well above empty. One full discharge-charge cycle lets the fuel gauge IC map the new cell's actual voltage cliff and adjust the low-voltage warning point accordingly. After calibration, shutdowns at 20–30% typically stop.

Phone won't power on after the replacement cell sat in storage

Li-ion cells self-discharge in storage. If this battery sat long enough before installation, the cell voltage may have dropped below 2.5V — the point where the BMS locks out to prevent damage from over-discharge. The SGH-I727 will show no response at all: no boot, no charging indicator. Connect it to a wall charger, not a USB port, and leave it for 20–30 minutes without pressing the power button. A wall adapter can push enough trickle current to bring the cell back above 2.8V, at which point the BMS releases the lockout and normal charging resumes.