Kastar 4-Pack Battery and USB Charger Compatible with Olympus BLS-50

In this review the Kastar 4-Pack battery and USB charger is assessed for photographers who need multiple spares and a flexible charging solution. The bottom line: it is a practical, budget-friendly kit for owners of Olympus cameras that use BLS-50/BLS-5 series batteries, offering a total of four 2100mAh lithium-ion cells and a dual USB charger that can top up two batteries at once. For travel shooters and weekend hobbyists who value capacity and charging flexibility, this kit delivers straightforward, reliable power without unnecessary extras.

Key Features

• Battery Capacity: Each lithium-ion cell provides 2100mAh at 7.4V, giving noticeably longer shooting time than many OEM single-pack options.
• Dual Charging: The charger can charge two batteries simultaneously, which reduces downtime between shoots and is useful when running multiple camera bodies or long sessions.
• Interchangeable Plate: The charger plate can be changed to accommodate different batteries, adding convenience when switching battery types.
• Multiple Inputs: With both Micro-USB and USB-C input plus a supplied Micro USB cable, the charger works with common power banks and USB adapters for on-the-go charging.
• Intelligent LED Display: The LED indicators show charging status and battery capacity so users can quickly see when cells are ready to use.

Who It's For

This kit is aimed at Olympus mirrorless owners who use BLS-50, PS-BLS50, BLS-5 or PSBLS5 batteries, including popular bodies like the OM-D E-M10 series and OM-5. It fits photographers who need multiple spare batteries and the convenience of charging two cells at once, such as travel shooters, event photographers, and hobbyists who prefer to carry extras rather than hunt for wall outlets.

Those who should look elsewhere include professionals who require official OEM batteries for warranty reasons or those who need ultra-fast proprietary charging. Also, buyers who do not use Olympus BLS-type batteries will want a kit specified for their battery model.

Pros & Cons

Pros

• Good value pack with four 2100mAh lithium-ion batteries for extended shooting time.
• Dual charging capability reduces wait time by replenishing two batteries simultaneously.
• Multiple input options and an included cable make the charger flexible for travel and power banks.
• LED indicators communicate charge status so users can manage spares efficiently.

Cons

• Not an official Olympus accessory, so users who prefer OEM parts may opt for the manufacturer charger and batteries.
• Charging speed is moderate (8.4V 800mA outputs), so charging can take longer than high-current dedicated chargers.

Specifications

Our Verdict

The Kastar 4-Pack with USB dual charger is a sensible buy for Olympus users who need extra runtime and convenient on-the-go charging. It pairs high-capacity 2100mAh cells with a flexible charger that accepts common USB power sources, making it excellent value for hobbyists and traveling photographers who want dependable backup power without spending on OEM kits.

Frequently Asked Questions

Will these batteries fit my OM-D E-M10 camera?
Yes, the pack is compatible with the Olympus OM-D E-M10 series and other models that use BLS-50/BLS-5 batteries.

Can the charger power from a power bank?
Yes, the charger accepts Micro-USB and Type-C input and works with typical 5V USB power banks and adapters.

How many batteries can charge at once?
The charger can charge up to two batteries at the same time using its dual charging slots and LED status indicators.