Battery for Nokia C6 / C6-00 / C600 / Lumia 620 — forever BL-4J Li-Ion 1050mAh

Replacement forever BL-4J Li‑Ion battery compatible with Nokia C6, C6-00, C600 and Lumia 620. Rated capacity 1050 mAh, designed as a removable phone battery to restore device runtime for everyday mobile use including calls, messaging and basic smartphone functions.

Advantages

The forever BL-4J is a lithium-ion replacement battery with a nominal capacity of 1050 mAh, designed to match the form factor and electrical characteristics of the original battery used in Nokia C6, C6-00, C600 and Lumia 620. It provides a straightforward swap-in replacement for worn or faulty cells, restoring usable operating time without requiring software updates or device modifications. The battery is lightweight and intended for standard charging with compatible chargers.

Suitable for

• Nokia C6 mobile phones
• Nokia C6-00 devices
• Nokia C600 models
• Nokia Lumia 620 phones
• Replacing worn or degraded removable batteries

Key specifications

• Battery type: Lithium‑Ion (Li‑Ion)
• Rated capacity: 1050 mAh
• Intended use: removable phone battery for daily mobile functions
• Compatible devices: Nokia C6, C6-00, C600, Lumia 620
• Physical form: replaceable pack matching original battery dimensions

How to use

Power off the phone before replacing the battery. Remove the back cover and take out the old battery following the device manufacturer's guidance. Insert the forever BL-4J battery with correct polarity, reattach the back cover, and power on the phone. Charge the battery using the phone's original charger or a charger compatible with the device's charging specifications. Allow one full charge cycle for optimal initial performance.

Usage recommendations

Use the battery only in compatible models listed. Avoid exposing the battery to high temperatures, direct sunlight, water or mechanical stress. Do not attempt to disassemble or puncture the battery. Recycle used batteries according to local regulations.