EB-L1K6ILA Samsung SGH-T699 Replacement Battery 3.7V 1500mAh

Samsung SGH-T699 / Galaxy S Blaze Q — 3.7V Li-ion Replacement Battery (EB-L1K6ILA)

This is a 3.7V, 1500mAh Li-ion replacement battery for the Samsung SGH-T699, Galaxy S Blaze Q, Relay 4G, and SCH-i415. It replaces OEM part numbers EB-L1K6ILA, EB-L1K6ILZ, and EB-L1K6ILABXAR. Swap it in when the original cell no longer holds charge or causes unexpected shutdowns.

• SGH-T699 / Relay 4G / SCH-i415 compatibility: These models share the same 3.7V single-cell Li-ion architecture, identical connector pinout, and the same BMS handshake protocol — one cell SKU covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through full discharge and charge on the SGH-T699 and confirmed the BMS accepted the handshake, charge IC engaged normally, and the fuel gauge IC began tracking state-of-charge without fault codes.
• Fuel gauge recalibration on first install: Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC is still calibrated to the old cell's discharge curve — letting it run one full cycle at standard current gives it accurate data before high-current charging begins.

Sudden shutdown at 20–30% on the SGH-T699 after a cell swap

This happens because the fuel gauge IC maps state-of-charge using a discharge curve it learned from the old, degraded cell. The new cell has a steeper voltage drop under modem and screen load than the IC expects at that percentage. When the voltage sags below the cutoff threshold — typically around 3.4V under load — the BMS trips and the phone shuts down even though the reported percentage still looks healthy. Run one uninterrupted full discharge down to automatic shutoff, then charge to 100% without interruption, and the coulomb counter will re-anchor to the new cell's actual curve.

Phone not powering on after the replacement battery sat in storage

Li-ion cells self-discharge during storage, and if a cell drops below approximately 2.5V, the BMS enters a lockout state to prevent damage from deep discharge. The phone will show no response — no boot, no charge indicator — when this happens. Connect the original charger and leave it for 15–20 minutes without pressing the power button; the charge IC will trickle current into the cell until voltage rises above the BMS re-enable threshold. Once the charge LED activates or the screen shows the battery icon, the BMS has re-initialised and normal charging will resume.