Kastar 2-Pack EN-EL4a Battery Replacement for Nikon - High Capacity

In this review the Kastar 2-Pack EN-EL4a Battery replacement is evaluated for photographers who need reliable spares for older Nikon bodies. The bottom line: this two-pack delivers clear value for extended shooting sessions thanks to its 3200mAh high capacity cells and built-in protection circuits. Our review finds these batteries are a practical, cost-effective way to keep models such as the Nikon D2, D3 series, and D700 running longer without the premium price of original-brand packs.

Key Features

• High Capacity: Each 3200mAh cell provides longer run time so photographers can shoot more frames between charges.
• Compatible Models: Works with EN-EL4, EN-EL4a and EN-EL4e battery slots and supports a long list of Nikon cameras including D2, D3 and D700 bodies.
• Safety Protections: Built-in over-charge, over-discharge, over-voltage, over-current, and over-heating protection help protect the camera and battery during use.
• Charger Support: Designed to work with MH-21 and MH-22 chargers so you can reuse existing charging gear.
• Two-Pack Convenience: Includes two batteries so users get immediate backup power for extended shoots or multi-day gigs.

Who It's For

This replacement pack is best for photographers who own legacy Nikon bodies that use EN-EL4 series batteries and who need affordable, high-capacity spares for events, travel, or studio work. It suits pros and advanced enthusiasts who already have compatible chargers like the MH-21 or MH-22 and want longer run time without buying rare OEM stock.

Casual users with newer Nikon systems or those who prefer only OEM batteries should look elsewhere, since this pack is specifically designed as a replacement for older EN-EL4 family cameras and not modern battery formats.

Pros & Cons

Pros

• High 3200mAh capacity extends shooting time between charges for demanding sessions.
• Built-in protection circuits meet UL1642 and CE standards for safer operation.
• Two-pack packaging gives immediate backup without waiting to recharge.
• Compatibility with MH-21 and MH-22 chargers reduces additional purchase needs.

Cons

• Designed for older Nikon EN-EL4 series cameras, so it is not suitable for modern Nikon battery formats.
• Requires confirmation of charger and camera compatibility (BL-3 cover noted for some grips).

Specifications

Battery Type	Lithium-ion
Voltage	11.1V
Capacity	3200mAh
Pack Quantity	2-Pack
Compatibility - Batteries	EN-EL4, EN-EL4a, EN-EL4e
Compatibility - Chargers	MH-21, MH-22

Our Verdict

The Kastar 2-Pack EN-EL4a replacement is a sensible buy for owners of older Nikon pro bodies who need dependable, higher-capacity spares. With safety certifications, protective circuitry, and two batteries in the box, it offers strong value for event shooters and studios that require extended runtime without sourcing rare OEM units.

Frequently Asked Questions

Will these batteries work in my D3 or D700?
Yes, they are compatible with Nikon D3, D3S, D3X and D700 as these models accept EN-EL4 series batteries.

Do I need a special charger?
No, these batteries are designed to work with MH-21 and MH-22 chargers; use your existing compatible charger when available.

Is it safe to use non-OEM batteries?
These Kastar cells meet UL1642 and CE safety standards and include over-charge and over-heat protection, making them a safe aftermarket option when used correctly.