Kastar EN-EL4a AC LCD Dual Fast Charger - Dual Slot Fast Charge

In this review the Kastar EN-EL4a AC LCD Dual Fast Charger is presented for photographers who need a reliable, multi-battery charging solution. The bottom line: it is best for photographers and prosumers who use Nikon EN-EL4 series batteries and want simultaneous, intelligent charging with clear status feedback. The reviewer found the LCD readout and dual fast-charge capability to be the single biggest reason to buy, since it lets two batteries charge at once while the chargers MCU logic prevents overcharge and supports worldwide 110-240V use.

Key Features

• Dual Fast Charging: Charges two compatible EN-EL4 series batteries at the same time to reduce downtime between shoots.
• Wide Input Voltage: Works with 110-240V worldwide input so it can be used on location without a separate converter.
• LCD Status Display: The LCD displays charging status and battery capacity so users can monitor progress at a glance.
• Intelligent MCU Control: The built-in controller auto-identifies battery voltage and prevents overcharge for safer charging cycles.
• CC/CV Charging with 0V Activation: Uses constant-current/constant-voltage charge with pre-charge and 0V activation to maintain battery health.

Who It's For

This charger is aimed at Nikon shooters using EN-EL4, EN-EL4a, or EN-EL4e batteries, or owners of camera models that accept those packs such as the D2, D3 series, and F6 bodies. It suits event and studio photographers who keep multiple spares and need a compact, travel-ready unit with clear charging feedback.

It is less suitable for users who do not own EN-EL4 series batteries or who require brand-specific OEM chargers for warranty reasons; those users should look for a charger specifically supplied by the camera manufacturer.

Pros & Cons

Pros

• Dual-slot design lets two batteries charge simultaneously, saving time between sessions.
• Universal 110-240V input is convenient for travel and location shoots worldwide.
• LCD and intelligent MCU control provide clear status and protect batteries from overcharge.
• CC/CV charging with pre-charge and 0V activation helps extend battery life for Li-ion packs.

Cons

• Compatibility is limited to EN-EL4 family batteries, so it will not work with unrelated battery types.
• Some camera models or grips (MB-40/MB-D10) may require an extra chamber cover for battery fitment.

Specifications

Model	Kastar EN-EL4a LCD Dual Fast Charger
Compatible Batteries	Nikon EN-EL4, EN-EL4a, EN-EL4e
Compatible Cameras	D2, D2H, D2Hs, D2X, D2Xs, D3, D3S, D3X, F6, D300, D300S, D700
Input Voltage	110-240V worldwide
Charging Method	CC/CV with pre-charge and 0V activation
Display	LCD shows charging status and battery capacity

Our Verdict

The Kastar EN-EL4a dual charger is a practical and cost-effective choice for photographers who use Nikon EN-EL4 family batteries and need reliable, simultaneous charging with intelligent safeguards. Its worldwide voltage support and LCD status readout make it particularly good value for travelers and professionals who keep multiple batteries ready between shoots.

Frequently Asked Questions

Does this charger work outside the US?
Yes, it supports 110-240V input so it can be used worldwide with the appropriate plug adapter.

Which batteries will charge in this unit?
It is compatible with Nikon EN-EL4, EN-EL4a and EN-EL4e batteries and charges two at once.

Do I need any extra parts for use with camera grips?
Some grips and battery chambers such as MB-40 or MB-D10 may require an extra BL-3 battery chamber cover to fit the battery correctly.