Kastar 4-Pack Battery Charger 8.4V Output - Dual Smart USB Charger

Our review of the Kastar 4-Pack Battery Charger focuses on shooters and videographers who need a compact, flexible charger for Sony NP-FH series batteries. The bottom line: this is a practical, travel-friendly dual charger that handles two 7.2V Lithium-Ion packs at once and clearly shows charging status with intelligent LEDs. It is best for users who rely on Sony NP-FH30 through NP-FH100 compatible batteries and want a USB-powered, replaceable-plate solution rather than a bulky mains-only dock.

Key Features

• Dual charging: Can charge two batteries at the same time, which reduces downtime during shoots or long recording sessions.
• Interchangeable plate: The charger plate can be changed to fit different batteries, adding compatibility and future-proofing for similar battery packs.
• USB power options: Multiple charging inputs including Micro-USB and Type-C mean it can run from common USB power banks or phone adapters for field use.
• Clear LED indicators: Intelligent LED display shows charging status and remaining battery capacity so you can tell at a glance which cells are ready.
• Portable power: With a compact 5V 2-3A input and included Micro USB cable, the unit is easy to carry and set up away from a studio environment.
• Appropriate output: The charger supplies 8.4V at 800mA per slot, which matches the charging requirements for the specified NP-FH batteries.

Who It's For

This charger is aimed at amateur and semi-pro videographers, event shooters, and any camera user who relies on Sony NP-FH30, NP-FH40, NP-FH50, NP-FH60, NP-FH70 or NP-FH100 compatible batteries. It is particularly useful for those who need a small, USB-powered solution to keep multiple spares topped up during a day of shooting.

People who need ultra-fast multi-bank charging or full studio power distribution should look elsewhere; the 800mA per slot output is solid for overnight or daytime top-ups but not a high-speed charge solution for professional house-of-card workflows that demand rapid replenishment of many packs at once.

Pros & Cons

Pros

• Charges two batteries simultaneously, cutting wait time between shoots.
• Interchangeable plate design increases compatibility across NP-FH battery sizes.
• USB inputs (Micro-USB and Type-C) allow flexible power sources like power banks.
• LEDs provide clear status and approximate battery capacity so users can plan swaps.

Cons

• Per-slot charging current is 800mA, so charging is not the fastest option available.
• Only a Micro USB cable is included; Type-C cable may need to be sourced separately for some users.

Specifications

Battery Type	Lithium-Ion
Battery Voltage	7.2V
Battery Capacity	2650mAh
Charger Input	5V 2-3A 15W (USB)
Charger Output	8.4V 800mA (x1) 800mA (x2)
Charging Slots	Can charge 2 batteries at the same time
Included Cable	Micro-USB cable

Our Verdict

The Kastar 4-Pack Battery Charger is a sensible, value-focused choice for photographers and videographers who need a compact, USB-powered dual charger for Sony NP-FH compatible batteries. It combines portability, clear LED status, and interchangeable plates to cover most field needs, though those requiring the fastest possible charge rates should consider higher-current alternatives. Overall it offers good utility at a modest price point.

Frequently Asked Questions

Can this charger run from a USB power bank?
Yes, the charger accepts 5V input and will run from most power banks that can supply 2-3A.

Does it charge two batteries at full speed?
It charges two batteries simultaneously at 800mA per slot, which is adequate for top-ups but not a high-speed rapid charge.

Are cables included for both Micro-USB and Type-C?
A Micro-USB cable is included; Type-C input is supported but a Type-C cable may need to be supplied separately.