Kastar 3-Pack CGA-DU21 Battery Replacement - High Capacity 2900mAh

In this review the Kastar 3-Pack CGA-DU21 replacement batteries are evaluated for users who need reliable extended runtime for older Panasonic camcorders. The bottom line: these batteries offer a clear improvement in operating time thanks to the high capacity 2900mAh cells and comprehensive protection circuitry, making them a practical choice for videographers, hobbyists, or anyone who needs multiple spare packs without paying for OEM pricing. Installation is straightforward and they are compatible with a wide range of Panasonic NV-GS models.

Key Features

• High Capacity: Each battery provides 2900mAh at 7.2V so users get noticeably longer recording time between charges compared with many older or low-capacity replacements.
• Broad Compatibility: The pack is designed to replace CGA-DU21, CGA-DU14, CGA-DU12, CGA-DU07, CGA-DU06 and related models, and works with many NV-GS camcorders for straightforward fit and operation.
• Safety Protections: Built-in safeguards for over-charge, over-discharge, over-voltage, over-current, and over-heating help protect the camera and extend battery life.
• Certified Cells: The lithium-ion cells meet UL1642 and CE safety standards, which reassures buyers who prioritize compliance and safe use.
• Value Pack: The 3-pack format reduces downtime by keeping multiple spares on hand and lowers the cost per battery versus buying singles.

Who It's For

This kit is aimed at owners of legacy Panasonic camcorders who need extended runtime for field shoots, travel, or long events and who prefer replacement packs that include safety protections. The three batteries make it useful for semi-professional users who cannot pause frequently to recharge.

It is less appropriate for users who require official OEM branding or who use camera models not listed in the compatibility notes; those users should verify model fit or consider alternate power solutions if their camera is not in the NV-GS series compatibility list.

Pros & Cons

Pros

• Longer run time from the 2900mAh capacity compared with many third-party alternatives.
• Comprehensive internal protection circuit improves safety and helps preserve cycle life.
• Three batteries in one package reduce interruptions during longer shoots and are cost effective.
• Wide compatibility with many Panasonic NV-GS camcorder models simplifies selection.

Cons

• Not an OEM Panasonic battery, so collectors or strict brand purists may prefer original batteries.
• Compatibility must be checked carefully against camera and charger model lists before purchase.

Specifications

Battery Type	Lithium-ion
Voltage	7.2V
Capacity	2900mAh
Pack Quantity	3-Pack
Safety Standards	UL1642, CE
Protections	Over-charge, over-discharge, over-voltage, over-current, over-heating

Our Verdict

The Kastar 3-Pack CGA-DU21 replacement batteries deliver practical value for users of compatible Panasonic camcorders who need dependable extended runtime and safety protections without paying premium OEM prices. For shooters who carry spare packs and want longer recording sessions, this kit is a sensible, cost-effective choice that reduces downtime and provides peace of mind through certified cells and built-in protection.

Frequently Asked Questions

Will these batteries fit my NV-GS37 camcorder?
Yes, the pack lists compatibility with NV-GS37 and many other NV-GS models, but always confirm the camera battery model matches one of the replacement model numbers before purchasing.

Do these batteries include protection circuits?
Yes, each battery pack includes over-charge, over-discharge, over-voltage, over-current, and over-heating protection circuitry.

How many batteries are in the package?
The product ships as a 3-pack so you receive three replacement batteries in the set.