Kastar NP-400 Battery 4-Pack and LTD2 USB Charger - Compact Power Pack

In this review the Kastar 4-Pack NP-400 Battery and LTD2 USB Charger is presented as a practical replacement kit for owners of older Konica Minolta, Pentax, Samsung, and Sigma cameras. The bottom line: this kit is for photographers who need reliable spare power and flexible charging without carrying bulky gear. The reviewer found the 2400mAh lithium-ion batteries provide reassuring capacity for all-day shoots, while the dual USB charger and interchangeable plates make charging multiple compatible batteries convenient for travel and field use.

Key Features

• High capacity battery: The 2400mAh 7.4V lithium-ion cells give longer runtime than many stock batteries, reducing the need to swap power mid-shoot.
• Dual battery charging: The LTD2 charger can charge two batteries simultaneously so a pair of spares can be topped up quickly between sessions.
• Interchangeable plates: The charger allows changing the plate to fit different battery contacts, which adds versatility across compatible models.
• USB powered convenience: With Micro-USB and Type-C input and a provided Micro USB cable, the charger runs from power banks, laptop ports, or wall adapters for on-the-go charging.
• Intelligent LED indicators: The charger shows charging status and relative battery capacity so users can see when batteries are ready without guesswork.

Who It's For

This kit is best for hobbyists and pros using legacy cameras that take the NP-400 / Pentax D-Li50 / Samsung SLB-1674 / Sigma BP-21 style batteries, including Dynax and Maxxum models. It suits photographers who travel light and prefer USB charging from power banks or multiport adapters instead of carrying proprietary wall chargers.

Those who should look elsewhere are users needing OEM-branded chargers with camera-specific warranties or photographers who require a faster high-output charging solution for very rapid turnaround; the LTD2 is a practical, general-purpose USB charger rather than a specialized fast charger.

Pros & Cons

Pros

• Four 2400mAh batteries provide ample spare power for extended shoots and reduce downtime.
• Charger can charge two batteries at once, improving workflow when multiple cells are used.
• USB input options and a supplied Micro USB cable make charging from common sources easy while traveling.
• LED indicators clarify charge status so users know when a battery is ready.

Cons

• The kit is a replacement third-party solution rather than an OEM charger, which some users may prefer for brand-specific support.
• Charging speed is limited by the charger output (8.4V 800mA per bay) so it is not the fastest possible option for rapid top-ups.

Specifications

Battery Type	Lithium-Ion
Battery Voltage	7.4V
Battery Capacity	2400mAh
Charger Input	5V 2-3A USB (15W)
Charger Output	8.4V 800mA (x1) and 800mA (x2)
Charging Ports	Dual bay with interchangeable plate; Micro-USB and Type-C input

Our Verdict

The Kastar 4-Pack NP-400 Battery and LTD2 USB Charger is a sensible value for photographers needing dependable spare batteries and flexible USB charging. It is especially good for travel and field work with cameras that accept NP-400 style cells, offering a practical balance of capacity, convenience, and compatibility for most users.

Frequently Asked Questions

Are these batteries compatible with Konica Minolta NP-400?
Yes, the pack is compatible with Konica Minolta NP-400 and equivalent models from Pentax, Samsung, and Sigma.

Can the charger charge two batteries at once?
Yes, the LTD2 charger supports simultaneous charging of two batteries with LED status indicators for each bay.

Does the kit include a charging cable?
Yes, a Micro USB cable is included and the charger also accepts Type-C input for flexible USB power sources.