Kastar EN-EL4a Battery and Dual Fast Charger - Reliable Backup Power

Our review of the Kastar EN-EL4a Battery and AC LCD Dual Fast Charger finds it best suited for photographers who need a reliable replacement battery and a versatile charger that handles two batteries at once. The biggest reason to consider this kit is its combination of a high-capacity 3200mAh lithium-ion battery and an intelligent dual fast charger that supports worldwide 110-240V input and 6.8V to 16.8V battery ranges, so it works for older Nikon EN-EL4 series packs and matches many camera setups while offering protection against overcharge.

Key Features

• Replacement battery: The Kastar lithium-ion battery at 11.1V and 3200mAh provides extended runtime compared with many original OEM batteries, making longer shoots more manageable.
• Dual fast charging: The LCD dual fast charger can simultaneously charge two batteries, reducing downtime between sessions for pro and enthusiast shooters.
• Wide voltage range: The charger accepts batteries with 6.8V to 16.8V and 110-240V input, so it will work in varied locations and with multiple compatible battery models.
• Smart MCU control: Intelligent charge control automatically identifies battery voltage and prevents overcharge for safer charging and longer battery life.
• Charging algorithm: The CC/CV charging method with pre-charge and 0V activation offers reliable charging performance for Li-ion cells and can revive deeply discharged packs.
• LCD status display: The charger LCD shows charging status and battery capacity so users can monitor progress at a glance.

Who It's For

The Kastar pack is aimed at photographers using older Nikon cameras that accept EN-EL4, EN-EL4a, or EN-EL4e batteries, including those who rely on battery grips such as the MB-D10. It is a practical choice for wedding, event, or wildlife photographers who need extra runtime and the convenience of charging two batteries simultaneously.

Casual users who shoot infrequently or those who require manufacturer warranty support from Nikon may prefer original batteries and chargers. Also, if your workflow depends on integrated camera firmware battery reporting, third-party batteries sometimes show minor differences in on-camera gauges.

Pros & Cons

Pros

• High 3200mAh capacity gives noticeably longer shooting time compared to older lower-capacity packs.
• Dual fast charger with LCD and intelligent MCU control offers safer, simultaneous charging and clear status information.
• Wide 110-240V input and broad battery voltage compatibility make it travel-friendly and versatile for multiple cameras.

Cons

• Third-party batteries can sometimes report charge level differently on-camera compared with OEM packs.
• Using in some camera setups requires an extra BL-3 battery chamber cover, which is not included.

Specifications

Brand	Kastar
Battery Type	Lithium-Ion
Battery Voltage	11.1V
Battery Capacity	3200mAh
Charger Input	110-240V worldwide
Charger Compatibility	6.8V - 16.8V batteries, LCD dual fast charger
Compatible Models	Nikon EN-EL4 / EN-EL4a / EN-EL4e; MH-21 / MH-22; Grip MB-D10, D300, D300S, D700

Our Verdict

The Kastar EN-EL4a battery and dual fast charger is a solid value for photographers who need dependable backup power and flexible charging. With a high-capacity 3200mAh pack, intelligent MCU protection, and the ability to charge two batteries at once on worldwide voltage, it suits active shooters who travel or work long days and want a practical alternative to OEM options.

Frequently Asked Questions

Will this battery fit my Nikon D300 or D700?
Yes, it is compatible with cameras that accept EN-EL4 series batteries, including the D300, D300S and D700; note some setups require the BL-3 chamber cover.

Can the charger handle international voltage?
Yes, the charger accepts 110-240V input so it can be used in most countries with the appropriate plug adapter.

Can the charger charge two different battery models at once?
The charger supports a wide voltage range (6.8V to 16.8V) and can charge two batteries simultaneously, but confirm each battery model falls in that range.