Kastar 3-Pack EN-EL4a Battery and Dual Fast Charger - Reliable Power

In this review the Kastar 3-Pack EN-EL4a Battery and AC LCD Dual Fast Charger is assessed for photographers who need dependable spares and rapid charging. The bottom line: this kit is aimed at Nikon D2/D3 series users and owners of camera grips who want long runtime and an intelligent charger without paying original-brand prices. The reviewer found the three 3200mAh lithium-ion batteries and the LCD dual charger deliver consistent capacity and sensible charging controls, making it a practical choice for shoot days and travel where quick turnaround on cells matters.

Key Features

• High capacity cells: Each battery is 3200mAh at 11.1V, offering extended runtime for long shoots and multipage sessions without frequent swaps.
• Wide charger input: The dual fast charger supports 110-240V worldwide input so it can be used overseas with the correct plug adapter.
• Dual simultaneous charging: The LCD charger can charge two batteries at the same time, reducing downtime between sessions.
• Smart control: Built-in MCU control automatically identifies battery voltage and applies intelligent CC/CV charging to help prevent overcharge.
• 0V activation and pre-charge: The charger supports pre-charging and activation of deeply discharged li-ion cells, which can restore neglected batteries to usable condition.
• Compatibility: Designed to replace Nikon EN-EL4/EN-EL4a/EN-EL4e and work with MH-21/MH-22 chargers and certain camera grips with an additional BL-3 chamber.

Who It's For

This kit is best for photographers who use Nikon cameras that accept EN-EL4 series batteries, and for those who want on-hand spares for event days, wildlife trips, or extended studio shoots. The long 3200mAh cells and dual charger particularly suit users who shoot tethered or in continuous burst modes and need reliable power between battery swaps.

It is less suitable for casual point-and-shoot users or owners of cameras that use different battery types. Professionals requiring official-brand warranty coverage or factory service should consider original manufacturer batteries instead.

Pros & Cons

Pros

• High capacity 3200mAh batteries deliver long runtime that reduces swap frequency.
• LCD dual fast charger provides simultaneous charging and clear status information.
• Wide 110-240V input and smart MCU control make the charger versatile for travel and safe charging.
• Pre-charge and 0V activation can recover deeply discharged cells, extending usable life.

Cons

• Compatibility with some Nikon grips requires an extra BL-3 chamber cover, which is not included.
• Third-party batteries may not offer the same service or warranty options as manufacturer originals.

Specifications

Product type	Replacement battery kit with charger
Battery type	Lithium-Ion
Battery voltage	11.1V
Battery capacity	3200mAh (each)
Charger input	110-240V worldwide
Charger features	LCD display, dual fast charging, CC/CV, 0V activation
Compatibility	Nikon EN-EL4/EN-EL4a/EN-EL4e, MH-21, MH-22, grips with BL-3 chamber

Our Verdict

The Kastar 3-Pack EN-EL4a Battery and AC LCD Dual Fast Charger is a practical value option for Nikon users who need multiple high-capacity spares and a smart, travel-ready charger. It provides sensible safety features and simultaneous charging at a lower cost than brand-name kits, making it a strong pick for event and outdoor shooters who carry extras and need predictable runtime.

Frequently Asked Questions

Are these batteries compatible with Nikon D3 and D700?
Yes, the EN-EL4/EN-EL4a compatible batteries work with Nikon D3 and D700 series cameras listed in the compatibility notes.

Does the charger work internationally?
Yes, the charger accepts 110-240V input for worldwide use; a country-specific plug adapter may be required.

Is the BL-3 battery chamber included for grip use?
No, the BL-3 chamber cover is not included and must be obtained separately if needed for certain camera grips.