Kastar 4-Pack NP-F550/NP-F570 Battery and LTD2 USB Charger - Reliable

In this review of the Kastar 4-Pack NP-F550/NP-F570 battery kit the bottom line is simple: this bundle is aimed at shooters and monitor users who need reliable, swappable power without carrying a tangle of proprietary chargers. The reviewer found it especially useful for extended on-location shoots where the FEELWORLD F570 and similar 5.5- to 7 in field monitors are used, because the 2900mAh lithium-ion cells and the dual-slot LTD2 USB charger let the operator keep two spares charged and ready. The kit is practical, compact, and focused on delivering usable runtime rather than extra gadgetry.

Key Features

• High capacity batteries: Each 2900mAh lithium-ion cell delivers extended runtime for field monitors so you spend more time shooting and less time swapping power.
• Dual charging: The LTD2 USB charger can charge two batteries simultaneously, which reduces downtime between takes when multiple cells are used.
• Flexible input options: Micro-USB and Type-C input support means you can power the charger from common USB power banks or wall adapters while on location.
• Universal plate change: The charger plate can be swapped to support different battery plates, making it useful for other camera accessories beyond FEELWORLD monitors.
• Compact and portable: With a 5V 2-3A 15W input and lightweight batteries, the set is easy to carry in a kit bag or pocket for run-and-gun shoots.

Who It's For

This kit is ideal for videographers and photographers who use on-camera field monitors such as FEELWORLD F570, FW568 V2, or similar monitors that accept NP-F550/NP-F570 batteries. It suits solo shooters and small crews who need straightforward, compatible spares that charge from USB power sources between scenes.

Those who should look elsewhere include users who require proprietary fast-charging systems tied to a specific brand ecosystem or users who need batteries with voltages or capacities outside the NP-F550/NP-F570 standard. For high-end broadcast rigs with built-in plate chargers, a manufacturer-specific solution may be preferable.

Pros & Cons

Pros

• High 2900mAh capacity provides noticeably longer runtime than older NP-F cells.
• The LTD2 charger handles two batteries at once, cutting total recharge time for a set of spares.
• USB power inputs (Micro-USB and Type-C) add convenience for charging from common power banks.
• Interchangeable plate increases compatibility across different devices and batteries.

Cons

• The charger output is modest (8.4V 800mA per slot), so recharge can be slower than higher-power dedicated desktop chargers.
• There is no included high-power wall adapter, only a Micro USB cable, so a suitable USB supply must be provided separately.

Specifications

Our Verdict

The Kastar 4-pack with LTD2 USB charger is a practical, cost-effective way to extend runtime for FEELWORLD and other NP-F550/NP-F570-compatible monitors. It delivers useful capacity and the convenience of USB charging, making it good value for independent filmmakers and run-and-gun shooters who need dependable spare batteries without extra bulk.

Frequently Asked Questions

Are these batteries compatible with FEELWORLD F570 and similar monitors?
Yes, the NP-F550/NP-F570 format matches the battery plates used on FEELWORLD F570 and many other FEELWORLD monitors listed in the product description.

Can the charger power batteries from a portable power bank?
Yes, the LTD2 accepts 5V input via Micro-USB or Type-C, so it can be used with USB power banks capable of 2-3A output.

Does the kit include a wall adapter?
No, the package includes a Micro-USB cable; a separate USB power adapter or power bank is required for wall charging.