Einhell BT-CD 10.8/3 LI Replacement Battery 10.8V 1500mAh

Einhell BT-CD 10.8/3 LI — 10.8V Li-ion Replacement Battery (4513377E)

This is a 10.8V 1500mAh Li-ion replacement battery for the Einhell BT-CD 10.8/3 LI cordless drill/driver. It fits the compact slide-in pack housing used on that drill platform. Voltage and capacity match the OEM spec exactly — 10.8V, 1500mAh (16.2Wh).

• BT-CD 10.8/3 LI platform fit: The BT-CD 10.8/3 LI uses a compact 10.8V slide rail with a specific contact layout and BMS handshake. This pack matches that rail geometry, contact pitch, and the voltage thresholds the tool's BMS expects to see on startup.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles using the BT-CD 10.8/3 LI platform. The BMS accepted the pack without fault codes, and overcurrent protection triggered correctly at motor-start inrush — no nuisance trips during normal trigger pulls.
• First-use load break-in: On first use, run the drill at half load for two cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and calibrate its overcurrent thresholds before you drive long fasteners or bore larger holes.

BMS cutoff on the BT-CD 10.8/3 LI motor-start inrush surge

When you pull the trigger on a drill, the motor draws a short burst of current — sometimes three to five times the running current — before it reaches operating speed. On a 10.8V pack with a tight overcurrent threshold, a worn or contaminated rail contact raises resistance just enough to push that spike over the BMS cutoff point. The pack then shuts off instantly, which looks like a dead battery. Clean the rail contacts on both the pack and the tool with a dry cloth, reseat the pack, and check the voltage reads 10.8V before attempting another trigger pull.

Charger not recognising the pack after storage

Li-ion packs that sit unused for several months can self-discharge below the charger's acceptance threshold — typically around 2.5V per cell. At that point, the charger sees the voltage as out of range and refuses to begin a charge cycle, often showing a blinking or solid red fault light. This is a BMS re-initialisation issue, not a dead pack. Some Einhell chargers support a recovery mode — consult the charger label for a trickle or wake-up sequence. If no recovery mode exists, a brief 10–15 minute trickle at 0.1C from a compatible bench supply can bring cell voltage back above 3.0V per cell, after which the standard charger will accept the pack normally.