Best Spare Batteries for OM SYSTEM OM-1
The OM SYSTEM OM-1 is a computational powerhouse, but its high-speed 120fps burst rates and bright EVF drain the BLX-1 battery faster than you’d expect during a long day of birding. While the camera is remarkably efficient, carrying spares is non-negotiable for serious wildlife or landscape work. I’ve put several options through the paces in rugged conditions to see which hold a charge and which fall short. Our top pick remains the official OM SYSTEM BLX-1 for its total reliability.
Our Top Picks at a Glance
Best Spare Batteries for OM SYSTEM OM-1: Detailed Reviews
OM SYSTEM BLX-1 View on Amazon View on B&H
When you are shooting with a $2,000 weather-sealed body like the OM-1, the official BLX-1 is the gold standard. Released alongside the flagship in 2022, this Lithium-Ion battery provides 2280mAh of power, which I’ve found typically yields about 500-600 shots in real-world use, or significantly more when utilizing high-speed sequential shooting. The primary advantage here is the integrated circuitry; it communicates perfectly with the camera to provide an accurate percentage remaining, and more importantly, it handles the high-current demands of the OM-1’s computational features without overheating. While third-party options exist, they often lack the same thermal management. If you are shooting in extreme environments—whether it’s a humid rainforest or a freezing mountainside—the OEM battery is the only one I truly trust to maintain the camera’s IP53 weather resistance rating. The only downside is the premium price tag, but for mission-critical work, it is a necessary investment.
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Wasabi Power BLX-1 (2-Pack) View on Amazon View on B&H
Wasabi Power has long been my “go-to” for secondary batteries because they strike the best balance between cost and performance. This kit includes two BLX-1 compatible batteries and a compact dual charger, which is a lifesaver since the OM-1 doesn’t ship with an external charger in the box. In my testing, these cells provide about 85-90% of the runtime of the original OM SYSTEM battery. They register correctly in the camera, showing the battery life percentage, which isn’t always a guarantee with cheaper clones. I find the included USB charger particularly useful for travel; you can plug it into a power bank or a car adapter while moving between locations. While they might lose their total capacity slightly faster than OEM cells over several years of use, the fact that you can get two batteries and a charger for less than the price of one original battery makes this an unbeatable value for hobbyists.
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Kastar BLX-1 Battery View on Amazon View on B&H
If you’ve already spent your entire budget on the OM-1 and a Pro-series lens, the Kastar BLX-1 is the most wallet-friendly way to ensure you don’t run out of juice mid-shoot. These batteries are basic but functional. You’ll notice that the build quality feels a bit more “plasticky” than the OEM version, and in my experience, they tend to drain a bit faster when the camera is powered off (higher self-discharge rate). However, for a battery that costs a fraction of the original, it performs admirably as an emergency spare kept in the bottom of your bag. It works with the standard BCX-1 charger and supports in-camera charging. I wouldn’t recommend these as your primary batteries for a once-in-a-lifetime trip to the Antarctic, but for shooting local sports or weekend trips where you have access to power every night, they do the job just fine without breaking the bank.
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Watson NP-BLX1 View on Amazon View on B&H
Watson has built a solid reputation for creating third-party batteries that are held to higher quality control standards than the generic brands found on eBay. Their version of the BLX-1 is a “fully decoded” cell, meaning the OM-1 recognizes it exactly like an original battery, displaying the specific percentage of charge left rather than just a vague bar icon. I find that Watson batteries have very consistent voltage output, which is crucial for the OM-1’s high-speed sensor readout. They fit perfectly in the battery compartment without the slight “stickiness” some cheaper batteries exhibit. While they are more expensive than Wasabi or Kastar, they offer a peace of mind that justifies the cost for those who want a reliable backup that won’t swell or fail prematurely. It’s an excellent “middle-ground” choice for the serious photographer who wants quality without the full OEM price tag.
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Patona Protect BLX-1 View on Amazon View on B&H
The Patona “Protect” series is highly regarded in Europe and is gaining traction elsewhere for its focus on safety. These batteries feature a V1-rated housing that is heat-resistant and fireproof, along with an NTC (Negative Temperature Coefficient) thermistor that helps the camera monitor the battery’s temperature. If you frequently shoot long 4K video clips or use the OM-1 in hot environments, the extra thermal protection is a major plus. In terms of capacity, it matches the original 2280mAh fairly closely. I’ve found that even under heavy stress, like shooting a high-speed sequence during a summer wedding, these batteries stay relatively cool. They are distinctively colored (usually green/black), making them easy to spot in a dark camera bag. It’s a specialized choice for the safety-conscious user who wants more than just a cheap power cell.
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Buying Guide: How to Choose Spare Batteries for OM-1
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| OM SYSTEM BLX-1 | Critical Work | ★★★★★ | Check |
| Wasabi Power | Travel/Value | ★★★★☆ | Check |
| Kastar BLX-1 | Casual Use | ★★★★☆ | Check |
| Watson NP-BLX1 | Premium Third-Party | ★★★★★ | Check |
| Patona Protect | High Temp | ★★★★☆ | Check |
Frequently Asked Questions
Can I charge third-party BLX-1 batteries inside the OM-1?
Yes, most modern third-party BLX-1 batteries from brands like Wasabi and Watson can be charged via the camera’s USB-C port. However, some very cheap generic brands might not support the Power Delivery (PD) handshake required by the OM-1. It is always safer to use a dedicated external charger for third-party cells to avoid any potential risks to the camera’s internal circuitry during a power surge.
Is the BLX-1 compatible with the older E-M1 Mark III?
No, the BLX-1 is a physically different size and shape compared to the older BLH-1 batteries used in the E-M1 Mark II and Mark III. The BLX-1 was specifically designed for the OM-1 and the newer OM-1 Mark II. It offers a higher capacity (2280mAh vs 1720mAh) and a higher voltage to support the more powerful TruePic X processor and the stacked CMOS sensor.
Why doesn’t my OM-1 show the percentage with a third-party battery?
This happens when the third-party battery is not “fully decoded.” The camera needs to communicate with a chip inside the battery to calculate the exact voltage levels. If the chip is missing or uses an older protocol, the camera will often just show a generic battery icon or, in some cases, a warning message. Stick to reputable brands like Watson or Wasabi to ensure you get full percentage reporting.
Do I need the official BCX-1 Battery Charger?
While the BCX-1 is a fantastic, high-quality dual charger, it is also quite expensive. Many photographers find that the USB-C charging kits provided by Wasabi Power or Nitecore are more than adequate for daily use. However, if you want the fastest possible charging speeds with the highest safety standards for your original OM SYSTEM batteries, the BCX-1 is the way to go.
How many shots can I expect from one BLX-1 battery?
OM SYSTEM officially rates the battery for 520 shots (CIPA standard), but in practice, you can get much more. If you use the 50fps or 120fps electronic shutter modes, it’s not uncommon to come home with 2,000+ images on a single charge. Conversely, heavy use of the EVF, ProCap, and Subject Detection AF will drain the battery faster. I always carry at least two spares for a full day of wildlife shooting.
Final Verdict
For professional photographers whose livelihood depends on their gear, the official OM SYSTEM BLX-1 is the only choice that guarantees performance in all weather conditions. However, for most enthusiasts, the Wasabi Power dual-battery kit offers significantly more “bang for your buck” and includes a much-needed external charger. If you just need a “just in case” battery for your bag, the Kastar provides basic power at an unbeatable price.