Kastar 4-Pack 3.85V 1900mAh Battery and LTD2 USB Charger - Extra Power

In this review the Kastar 4-Pack 3.85V 1900mAh Battery and LTD2 USB Charger is evaluated for users who need reliable spare power for a GoPro HERO9. The bottom line: it is a practical, compact kit for shooters who record long days or multi-day trips and want the flexibility to charge two batteries at once. The reviewer found the batteries deliver expected run time for typical HERO9 use and the LTD2 charger offers convenient dual-battery charging with both Micro-USB and Type-C inputs, making it a useful backup option without unnecessary complexity.

Key Features

• Compatible Battery: The lithium-ion 3.85V 1900mAh cells are built to match the GoPro HERO9 battery profile so they swap in easily and power the camera for extended shooting.
• Dual Charging: The LTD2 charger can charge two batteries at the same time, which reduces downtime between sessions and keeps multiple spares ready.
• Swappable Plate: The charger plate can be changed to accept different battery types, adding versatility if you use multiple camera models.
• Charging Options: Multiple inputs including Micro-USB and Type-C let you charge from common power banks or phone chargers for field convenience.
• LED Indicators: Intelligent LED status lights display charging progress and approximate battery capacity so you can see when batteries are ready.
• Portable Power: The compact charger and four spare batteries are easy to pack, and the charger accepts 5V 2-3A 15W input for reasonably fast top-up times.

Who It's For

The Kastar 4-pack is aimed at hobbyists and content creators who use the GoPro HERO9 Black Edition and need several spare batteries for full days of recording, time-lapse runs, or multi-leg trips. Photographers who prefer to swap batteries rather than tether to external power will appreciate having four cells and a dual charger that works from USB sources.

It is less suitable for users who require professional-grade OEM batteries with manufacturer support or those who only occasionally shoot short clips and do not need multiple spares. If warranty-backed factory batteries are a priority, consider OEM options instead.

Pros & Cons

Pros

• Four 1900mAh lithium-ion batteries provide ample backup power for extended HERO9 use.
• Dual-slot LTD2 charger reduces wait time by charging two batteries simultaneously.
• Micro-USB and Type-C inputs increase charging flexibility with common cables.
• Compact kit is easy to carry and the LED indicators clearly show charging status.

Cons

• Not an OEM battery from the camera maker, so buyers seeking official warranty coverage may prefer original-brand cells.
• Charger output is limited to 800mA per slot, so charging is not the fastest available on the market.

Specifications

Brand	Kastar
Battery Type	Lithium-Ion
Battery Voltage	3.85V
Battery Capacity	1900mAh
Charger Model	LTD2 USB dual charger
Charger Input	5V 2-3A 15W (Micro-USB and Type-C)
Charger Output	4.2V 800mA (per slot)

Our Verdict

The Kastar 4-Pack 3.85V 1900mAh battery set with the LTD2 dual USB charger is a solid value for GoPro HERO9 users who need multiple spares and convenient USB charging. It balances capacity, portability, and flexible inputs to keep cameras running through long shoots, making it a good budget-conscious choice for enthusiasts and travel shooters.

Frequently Asked Questions

Are these batteries compatible with GoPro HERO9?
Yes. They are specified as compatible with GoPro HERO9 and the GoPro ADDBD-001 battery model.

Can the charger charge two batteries at once?
Yes. The LTD2 dual charger supports simultaneous charging of two batteries with LED status indicators.

What charging cables are included?
The kit comes with a Micro-USB cable and the charger also accepts Type-C input for added flexibility.