Rechargeable Battery Microsoft BV-T4D 3340mAh for Lumia 940 / 950 XL

Rechargeable Microsoft BV-T4D 3340mAh battery designed for Microsoft Lumia 940 and 950 XL restores mobile power for calls, apps and media. This replacement battery offers the nominal 3340mAh capacity in the same form factor and connection layout required by compatible Lumia models, allowing a direct swap with the original pack to recover runtime without changing device hardware.

Advantages

The battery provides the stated 3340mAh capacity intended to bring back extended talk and standby times compared with a depleted cell. As a rechargeable lithium-ion pack, it supports standard charging cycles used by the Lumia 940/950 XL chargers and integrates with the device power-management features. The physical dimensions and terminal placement match the original design to ensure correct installation and reliable electrical contact.

Suitable for

• Replacing a worn or failing battery in Microsoft Lumia 940
• Replacing a worn or failing battery in Microsoft Lumia 950 XL
• Restoring mobile runtime for calls, messaging and media playback
• Users who prefer to keep original device hardware and extend its usable life

Key specifications

• Battery chemistry: rechargeable lithium-ion
• Nominal capacity: 3340 mAh
• Intended device models: Microsoft Lumia 940, Lumia 950 XL
• Form factor: removable smartphone battery sized for compatible Lumia models
• Typical operating use: mobile phone power for calls, apps, standby and media

How to use

Power the device off before removing the back cover and taking out the existing battery. Align the replacement battery so its contacts match the device terminals and press it into place; replace the back cover and power the phone on. Charge the battery fully using the original Lumia charger or a compatible USB charger before first use to ensure accurate battery-level reporting. Follow the phone’s on-screen battery status indicators to monitor charge level and health.

Recommendations

To prolong battery life, avoid deep discharges and high-temperature exposure. Use the device’s power-saving settings when possible, keep the battery charged between about 20% and 80% for regular use, and store the battery at partial charge if not used for extended periods.