Kastar 4-Pack CGA-DU21 Battery Replacement for Panasonic Cameras

In this review the Kastar 4-Pack CGA-DU21 replacement batteries are evaluated for users who need reliable, long-run power for older Panasonic camcorders. The bottom line: this pack is for photographers and videographers who want extended runtime and fewer battery swaps; the standout reason to consider it is the high 2900mAh capacity per cell that noticeably extends shooting sessions compared with original lower-capacity cells. The review focuses on compatibility, safety features, and practical on-camera performance when used in the listed Panasonic NV-GS series cameras.

Key Features

• High Capacity: Each 2900mAh battery delivers longer continuous recording time so users spend less time swapping cells during shoots.
• Wide Compatibility: The pack is compatible with a long list of Panasonic CGA-DU21 and related models, making it useful for owners of many NV-GS series camcorders.
• Safety Protections: Built-in over-charge, over-discharge, over-voltage, over-current, and over-heating protection circuits help protect camera electronics and extend battery life.
• Certified Cells: Kastar uses lithium-ion cells that meet UL1642 and CE safety standards, providing reassurance for travel and professional use.
• Value Pack: The 4-pack reduces the frequency and cost of replacements for extended shoots or multi-battery workflows.

Who It's For

This product is best for owners of Panasonic NV-GS series camcorders who need dependable backup power for events, field shoots, or long recording sessions and who prefer buying in bulk to avoid mid-day battery changes. It is also appropriate for hobbyists and semi-pros who want an affordable way to maintain several charged batteries on hand.

Those who should look elsewhere include users with cameras not listed among the compatible models, or buyers who require OEM-branded batteries for warranty or professional rental house standards. If you need the smallest form factor for very compact cameras, check exact model fit before purchasing.

Pros & Cons

Pros

• Higher 2900mAh capacity yields noticeably longer runtime than many older replacement cells.
• Includes safety circuitry and meets UL1642 and CE standards, reducing risk during charging and use.
• Four batteries in the package provide immediate spares for extended shoots or multi-day work.
• Broad compatibility list with Panasonic NV-GS models and select charger compatibility simplifies integration into existing kits.

Cons

• These are third-party replacement batteries; some professional users prefer OEM cells for guaranteed factory support.
• Compatibility spans many models, so buyers should verify their exact camera model before purchase to ensure fit.

Specifications

Battery Type	Lithium-ion
Battery Voltage	7.2V
Battery Capacity	2900mAh
Package Quantity	4-Pack
Safety Standards	UL1642, CE
Protection Features	Over-charge, over-discharge, over-voltage, over-current, over-heating

Our Verdict

The Kastar 4-Pack CGA-DU21 replacement batteries are a strong value for Panasonic NV-GS camera owners who need extended runtime and multiple spares without paying OEM prices. With 2900mAh capacity and built-in safety protections, the pack is a practical choice for event shooters and hobbyists who want consistent performance and fewer interruptions during recording.

Frequently Asked Questions

Are these batteries compatible with NV-GS50 and NV-GS120?
Yes, the pack lists compatibility with both NV-GS50 and NV-GS120 among many other NV-GS series models; verify your exact camera model name before ordering.

Can these be used with original Panasonic chargers?
The listing notes compatibility with several Panasonic charger models; they are intended to work with compatible Panasonic chargers such as VSK0631 and similar models.

Do these batteries include protection against overheating?
Yes, each battery includes built-in protection circuits for over-charge, over-discharge, over-voltage, over-current, and over-heating to improve safety and longevity.