Kastar 2-Pack NP-F750/NP-F770 Battery and AC Charger - Reliable Power

In this review the Kastar 2-Pack NP-F750 / NP-F770 Battery and AC Wall Charger replacement is presented for shooters and videographers who use small on-camera field monitors. The bottom line: this kit is for operators who need long runtime and a compact charging option without replacing original manufacturer batteries. The reviewer found the 7.4V 5800mAh lithium-ion cells deliver noticeably longer operating time on FEELWORLD 5.7 in and 5.5 in monitors, while the included AC wall charger with foldable flat pin keeps desk and travel setup tidy and dependable.

Key Features

• High capacity cells: The 5800mAh lithium-ion batteries provide extended runtime so monitors run longer between swaps, reducing interruptions during shoots.
• Compatible voltage: The 7.4V rating matches NP-F750/NP-F770 style monitors and devices, which avoids voltage mismatch and simplifies replacement.
• Foldable charger pin: The AC wall charger has a foldable flat pin for compact storage and easier transport in camera bags.
• Wide input range: Charger input of AC 100~240V 50/60Hz supports use in many countries with the appropriate adapter, making it useful for travel.
• Charge status LEDs: Red indicates charging and green indicates standby or full-charge so users can tell battery state at a glance.
• Simple package: The kit ships with two batteries and one AC charger, which covers most short runs and desktop charging needs.

Who It's For

The kit is best for independent videographers, run-and-gun shooters, and small studio setups that use FEELWORLD field monitors such as the F570 5.7 in or S55 5.5 in models and need extra runtime without buying brand-name batteries. It is especially useful for anyone who prefers carrying a couple of spare cells rather than rigging external power solutions.

Those who need in-car charging, country-specific plugs bundled with the charger, or OEM warranty matching may want to consider alternatives; this package does not include a car adapter or European plug and is intended as a straightforward replacement power kit.

Pros & Cons

Pros

• Long 5800mAh capacity provides extended monitor operation between charges.
• LED indicators make it easy to monitor charge status without guessing.
• Foldable flat pin on the charger reduces bulk for travel and storage.
• Wide input voltage range allows use in varied mains regions with an adapter.

Cons

• Package omits a car adapter and alternate plug types, so those are bought separately if needed.
• Includes one charger only, so simultaneous charging of multiple batteries requires a separate charger or staggered charging.

Specifications

Battery type	Lithium-Ion
Battery voltage	7.4V
Battery capacity	5800mAh
Charger input	AC 100~240V 50/60Hz
Charger output	DC 8.4V 600mA
LED indicators	Red charging, Green standby/full
Package contents	2 batteries + 1 AC charger

Our Verdict

The Kastar 2-Pack NP-F750 / NP-F770 kit is a practical, cost-effective option for shooters who need reliable spare power for FEELWORLD 5.7 in and 5.5 in field monitors. With high-capacity 5800mAh cells and a compact charger, it offers solid value for extended shoots, though travelers needing car charging or additional plug types should plan to add adapters or accessories.

Frequently Asked Questions

Are these batteries compatible with FEELWORLD F570 and S55 monitors?
Yes, the kit is intended as a replacement for NP-F750/NP-F770 style batteries used by FEELWORLD F570 5.7 in and S55 5.5 in monitors.

Can the included charger be used worldwide?
The charger accepts AC 100~240V 50/60Hz so it works on many mains systems, but you may need a country-specific plug adapter; a car adapter is not included.

How will I know when a battery is fully charged?
The charger shows a red LED while charging and a green LED for standby or full-charge to indicate battery status.