Kastar 3-Pack CGA-DU21 Battery Replacement for Panasonic Cameras

In this review the reviewer looks at the Kastar 3-Pack CGA-DU21 replacement batteries for a range of older Panasonic camcorders and related models. The bottom line: this pack is for photo and video users who need extended run time and a straightforward, safe replacement for depleted OEM cells. The most compelling reason to buy is simple - a high capacity 2900mAh lithium-ion cell that delivers noticeably longer shooting sessions compared with original lower capacity batteries, making it easier to finish events or long shoots without swapping packs constantly.

Key Features

• High Capacity 2900mAh: The larger capacity extends record and playback time so a single battery lasts longer during continuous shooting or travel.
• 7.2V Lithium-ion Chemistry: Compatible voltage and chemistry ensure steady power delivery that matches the original Panasonic CGA-DU21 specification.
• Safety Protections: Built-in over-charge, over-discharge, over-voltage, over-current and over-heating protection adds peace of mind during charging and use.
• UL1642 & CE Standards: Cell construction meets recognized safety standards, which helps reduce the risk of failures compared with unknown generic cells.
• Three-Pack Value: Having three batteries in one package reduces downtime and replaces multiple originals so you can keep one charging while two are in use.
• Wide Compatibility: Works with a long list of Panasonic camcorder models and compatible chargers, making it useful across several older camera bodies.

Who It's For

This product is best for owners of older Panasonic camcorders and compatible models who regularly record long events, travel, or shoot multiple takes and want to avoid constantly swapping batteries. It is also a good option for videographers on a budget who prefer buying a multi-pack to keep a spare set charged and ready.

Less suitable are users who rely on the newest camera systems with different battery chemistries or form factors, and those who require official manufacturer warranty service tied to OEM batteries. Buyers should also verify the camera model lists in the product details before purchasing to ensure physical and electrical compatibility.

Pros & Cons

Pros

• Higher 2900mAh capacity provides longer runtime per charge compared to many original packs.
• Multiple safety protections and recognized UL1642 and CE safety compliance reduce operational risk.
• Three-pack setup offers clear value for users needing multiple batteries for shoots or travel.

Cons

• Not an official Panasonic branded battery, so users who want OEM labeling or warranty coverage may prefer original parts.

Specifications

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

Our Verdict

The Kastar 3-Pack CGA-DU21 replacement is a practical, cost-effective choice for owners of compatible Panasonic camcorders who need longer runtime and spare capacity for extended shoots. With safety features and a high 2900mAh rating, it represents good value for non-OEM replacements when compatibility is confirmed.

Frequently Asked Questions

Will these batteries fit my Panasonic CGA-DU21 camera model?
They are specified for CGA-DU21 and a long list of Panasonic camera models; verify your exact model against the compatibility list in the product details before purchase.

Can I charge these in my existing Panasonic charger?
Yes, the pack lists compatibility with several Panasonic charger models, but confirm your charger model number to ensure safe charging.

Are the batteries safe to use with travel and repeated charging?
Yes, the cells meet UL1642 and CE standards and include built-in protections for over-charge, over-discharge, over-voltage, over-current and over-heating.