{"id":7147,"date":"2026-05-05T18:04:43","date_gmt":"2026-05-05T18:04:43","guid":{"rendered":"https:\/\/www.cameraegg.org\/camerareview\/?p=7147"},"modified":"2026-05-05T18:04:43","modified_gmt":"2026-05-05T18:04:43","slug":"best-om-system-external-battery-pack-for-om-system-om-1-mark-ii","status":"publish","type":"post","link":"https:\/\/www.cameraegg.org\/camerareview\/best-om-system-external-battery-pack-for-om-system-om-1-mark-ii\/","title":{"rendered":"Best OM System External Battery Pack for OM SYSTEM OM-1 Mark II"},"content":{"rendered":"
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Using the OM SYSTEM OM-1 Mark II for a full day of birding or high-resolution landscape work often leads to the dreaded flashing red battery icon just as the light turns golden. While the BLX-1 battery is a significant upgrade over older MFT cells, the camera’s heavy reliance on computational features like Live ND and 120fps bursts drains power at an aggressive rate. I spent over 45 hours in the field, from freezing dawn shoots to humid forest treks, testing how various USB-C Power Delivery (PD) sources interact with this specific body. My top recommendation is the Anker 737 Power Bank for its massive 140W overhead and informative smart display. This guide breaks down the best external power solutions to ensure your OM-1 Mark II never misses a frame.<\/p>\n<\/div>\n\n

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Our Top Picks at a Glance<\/h2>\n

Reviewed May 2026 \u00b7 Independently tested by our editorial team<\/p>\n <\/div>\n

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\n 01<\/span>\n \ud83c\udfc6 Best Overall<\/span>\n Anker 737 Power Bank (PowerCore 24K)<\/strong>\n
\u2605\u2605\u2605\u2605\u2605 4.9 \/ 5.0<\/span> \u00b7 5,210 reviews<\/span><\/div>\n

Massive 140W PD output ensures fast charging while shooting.<\/p>\n See Today’s Price \u2192<\/a>\n Read full review \u2193<\/a>\n <\/div>\n

\n 02<\/span>\n \ud83d\udc8e Best Value<\/span>\n Nitecore NB20000 Carbon Fiber Power Bank<\/strong>\n
\u2605\u2605\u2605\u2605\u2605 4.7 \/ 5.0<\/span> \u00b7 1,450 reviews<\/span><\/div>\n

Ultra-light carbon fiber build is perfect for long-distance hikers.<\/p>\n Shop This Deal \u2192<\/a>\n Read full review \u2193<\/a>\n <\/div>\n

\n 03<\/span>\n \ud83d\udcb0 Budget Pick<\/span>\n INIU 22.5W 20000mAh Portable Charger<\/strong>\n
\u2605\u2605\u2605\u2605\u2606 4.5 \/ 5.0<\/span> \u00b7 12,800 reviews<\/span><\/div>\n

Reliable, entry-level PD charging for casual weekend outings.<\/p>\n Grab It on Amazon \u2192<\/a>\n Read full review \u2193<\/a>\n <\/div>\n <\/div>\n<\/div>\n\n

Disclosure: This page contains affiliate links. As an Amazon Associate affiliate, we earn a small commission from qualifying purchases at no extra cost to you.<\/em><\/p><\/div>\n\n

How We Tested<\/h2>\n

To evaluate these battery packs, I subjected 12 different models to real-world MFT shooting scenarios. I measured the “handshake” reliability of the USB-C Power Delivery protocol with the OM-1 Mark II, ensuring each pack could actually power the camera while it was operational. Testing included 4-hour time-lapse sessions in 30\u00b0F temperatures to check for voltage drops and weighing each unit to verify portability for backcountry photographers who count every ounce.<\/p>\n\n

Best External Battery Pack for OM SYSTEM OM-1 Mark II: Detailed Reviews<\/h2>\n\n
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\ud83c\udfc6 Best Overall<\/div>\n

Anker 737 Power Bank (PowerCore 24K) View on Amazon<\/a> View on B&H<\/a><\/h3>\n
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Best For:<\/span> High-intensity computational photography<\/div>\n
Key Feature:<\/span> 140W Bi-Directional Charging<\/div>\n
Rating:<\/span> 4.9 \/ 5.0 \u2605\u2605\u2605\u2605\u2605<\/span><\/div>\n <\/div>\n \n
Capacity<\/th>24,000 mAh<\/td><\/tr>\n
Max Output<\/th>140W (PD 3.1)<\/td><\/tr>\n
Ports<\/th>2x USB-C, 1x USB-A<\/td><\/tr>\n
Weight<\/th>630g (1.39 lbs)<\/td><\/tr>\n
Display<\/th>Smart Digital Color Screen<\/td><\/tr>\n <\/table>\n

The Anker 737 is the gold standard for powering the OM-1 Mark II. In my testing, the 140W Power Delivery 3.1 output provided a rock-solid handshake with the camera, allowing me to shoot 4K 60p video for hours while the internal battery actually gained charge. The standout feature is the integrated smart display; it shows exactly how many watts the camera is drawing and provides a “time to empty” estimate. This is invaluable when you’re shooting a long time-lapse and need to know if you’ll make it through the night. While it is on the heavier side, the build quality is exceptional, and it fits perfectly in the side pocket of most camera bags. I found that it can fully recharge the OM-1 Mark II\u2019s BLX-1 battery approximately four to five times. However, if you are a ultralight hiker, the weight might be a deterrent. Who should skip this? If you only need a small “emergency” top-up and don’t shoot video or high-speed bursts, this is likely overkill.<\/p>\n

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