--- product_id: 37315676 title: "OM SYSTEM Olympus BLH-1 Rechargeable Battery, Black" brand: "om system" price: "£84.64" currency: GBP in_stock: true reviews_count: 12 category: "Om System" url: https://www.desertcart.co.uk/products/37315676-om-system-olympus-blh-1-rechargeable-battery-black store_origin: GB region: Great Britain --- # 7.4V, 1720mAh power Approx. 440 shots/charge 37% more capacity OM SYSTEM Olympus BLH-1 Rechargeable Battery, Black **Brand:** om system **Price:** £84.64 **Availability:** ✅ In Stock ## Summary > 🔋 Power your passion with Olympus’ longest-lasting battery! ## Quick Answers - **What is this?** OM SYSTEM Olympus BLH-1 Rechargeable Battery, Black by om system - **How much does it cost?** £84.64 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/37315676-om-system-olympus-blh-1-rechargeable-battery-black) ## Best For - om system enthusiasts ## Why This Product - Trusted om system brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Pros:** Top-rated with 4.7 stars and proven superior to third-party clones. - • **Perfect Fit & Safety:** Designed specifically for Olympus E-M1 Mark II to avoid swelling and fit issues. - • **Reliable OEM Quality:** Genuine Olympus battery ensures stable, long-lasting performance. - • **Extended Shooting Power:** Capture 37% more moments with every charge. - • **Optimized Voltage & Capacity:** 7.4V and 1720mAh deliver consistent power for your E-M1 Mark II. ## Overview The OM SYSTEM Olympus BLH-1 Rechargeable Battery is a genuine replacement battery for the Olympus E-M1 Mark II camera, offering a 37% increase in capacity over its predecessor with approximately 440 shots per charge. Featuring 7.4V and 1720mAh power, it guarantees reliable, stable performance and a perfect fit, outperforming third-party alternatives in longevity and safety. ## Description Replacement battery for the Olympus E-M1 Mark II. Approx. 37% increase in capacity over BLN-1 battery with approx. 440 shots per charge. 7.4V and 1720 mAh power. Review: Expensive but worth it - My previous Olympus cameras used BLN-1 batteries, and third-party options had always worked almost as good as the Olympus batteries, and getting two replacement batteries for less than half the price of one original is a bargain that was hard to pass up. But finding good BLH-1 batteries for my EM1-II has proven to be a challenge. I tried several different third party brands and none of them last even half as long as the originals, and one swelled up so badly that it could no longer fit in the camera. Not sure why that's the case with the BLH-1 clones, but after my third set of crappy replacements, I finally gave in an bought the Olympus brand. The good thing I can say about this battery is that it will give you the longest lasting and most stable performance for your EM1-II. The downside is the price and the charger that comes with it. Third-party chargers are way better since they offer options like multiple battery charging and/or the ability to be plugged directly into a socket instead of dealing with wires. Review: Best option for most - I conducted two tests with the Olympus BLH-1 and the Wasabi and Power2000 fully decoded clones. The first test was a controlled-lighting tripod-mount time lapse on an E-M1.2 at 1 minute intervals with the screen active. The second test was a constant current discharge to 7.2V at a rate which resulted in discharge time roughly matching the number of pictures taken in the first test. The 7.2V cut-off point was chosen as that appears to be when the E-M1.2 powers off - batteries consistently measured around 7.4V after shut-off, which at a 500mA current drops to around 7.2V. As is to be expected, the Olympus BLH-1 matched the best of the two clones that I tested in terms of capacity at around 1500mAh. The Wasabi 2 pack had one battery also measure around 1500mAh while the other was only around 1200mAh. Meanwhile both Power2000 batteries only measured around 800mAh. So why would I recommend the Olympus BLH-1 for most when the Wasabi 2 pack costs the same and provides anywhere from 80% to 100% the capacity? Well, the variability is one mark against the Wasabi - it's clear they're not using a single supplier/specification for their 18500 cells given the variance I observed. Second is that the circuitry within the battery isn't quite on par with the Olympus as there's no mechanism for charge-balancing between the two cells. Charge-balancing circuitry ensures that both cells are always fully charged by effectively charging each cell individually. The BLH-1 clones lack this circuitry and instead charge the two cells serially, which over many charge-discharge cycles invariably results in one cell having a higher state of charge than the other due to minute differences in charge rate between them. This results in a much faster reduction in usable battery capacity as the battery will stop charging soon as one cell is fully charged even if the other is only half charged, while on the discharge side the camera will turn off soon after one cell is mostly 'discharged'. ## Features - Package Dimensions: 3.2 cms (L) x 6.2 cms (W) x 8.0 cms (H) - Product Type: Headphones - Package Quantity: 1 - Country Of Origin: China ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01M71IB4C | | Batteries | 1 Lithium Ion batteries required. (included) | | Best Sellers Rank | #1,820 in Camera Batteries | | Customer Reviews | 4.7 4.7 out of 5 stars (316) | | Date First Available | November 1, 2016 | | Is Discontinued By Manufacturer | No | | Item Weight | 2.56 ounces | | Item model number | BLH-1 | | Manufacturer | Olympus | | Product Dimensions | 0.8 x 1.8 x 2.1 inches | ## Product Details - **Battery Capacity:** 1720 Milliamp Hours - **Battery Cell Composition:** Lithium Ion - **Brand:** OM SYSTEM - **Number of Batteries:** 1 Lithium Ion batteries required. (included) - **Recommended Uses For Product:** Camera ## Images ![OM SYSTEM Olympus BLH-1 Rechargeable Battery, Black - Image 1](https://m.media-amazon.com/images/I/619TGQKOl8L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Expensive but worth it *by I***E on December 29, 2019* My previous Olympus cameras used BLN-1 batteries, and third-party options had always worked almost as good as the Olympus batteries, and getting two replacement batteries for less than half the price of one original is a bargain that was hard to pass up. But finding good BLH-1 batteries for my EM1-II has proven to be a challenge. I tried several different third party brands and none of them last even half as long as the originals, and one swelled up so badly that it could no longer fit in the camera. Not sure why that's the case with the BLH-1 clones, but after my third set of crappy replacements, I finally gave in an bought the Olympus brand. The good thing I can say about this battery is that it will give you the longest lasting and most stable performance for your EM1-II. The downside is the price and the charger that comes with it. Third-party chargers are way better since they offer options like multiple battery charging and/or the ability to be plugged directly into a socket instead of dealing with wires. ### ⭐⭐⭐⭐⭐ Best option for most *by E***T on September 10, 2020* I conducted two tests with the Olympus BLH-1 and the Wasabi and Power2000 fully decoded clones. The first test was a controlled-lighting tripod-mount time lapse on an E-M1.2 at 1 minute intervals with the screen active. The second test was a constant current discharge to 7.2V at a rate which resulted in discharge time roughly matching the number of pictures taken in the first test. The 7.2V cut-off point was chosen as that appears to be when the E-M1.2 powers off - batteries consistently measured around 7.4V after shut-off, which at a 500mA current drops to around 7.2V. As is to be expected, the Olympus BLH-1 matched the best of the two clones that I tested in terms of capacity at around 1500mAh. The Wasabi 2 pack had one battery also measure around 1500mAh while the other was only around 1200mAh. Meanwhile both Power2000 batteries only measured around 800mAh. So why would I recommend the Olympus BLH-1 for most when the Wasabi 2 pack costs the same and provides anywhere from 80% to 100% the capacity? Well, the variability is one mark against the Wasabi - it's clear they're not using a single supplier/specification for their 18500 cells given the variance I observed. Second is that the circuitry within the battery isn't quite on par with the Olympus as there's no mechanism for charge-balancing between the two cells. Charge-balancing circuitry ensures that both cells are always fully charged by effectively charging each cell individually. The BLH-1 clones lack this circuitry and instead charge the two cells serially, which over many charge-discharge cycles invariably results in one cell having a higher state of charge than the other due to minute differences in charge rate between them. This results in a much faster reduction in usable battery capacity as the battery will stop charging soon as one cell is fully charged even if the other is only half charged, while on the discharge side the camera will turn off soon after one cell is mostly 'discharged'. ### ⭐⭐⭐⭐⭐ Nothing works like the original Oly batteries *by D***R on August 28, 2018* The only thing to dislike is the price of the Olympus batteries. I also have some non-OEM batteries, but they don't have anywhere near the life of the Olympus batteries, and the meter on my OM-D EM-1 Mark II will not accurately gauge the percentage of battery life left in the generic batteries. Yeah, the generics were cheap, but at least they came with an awesome compact charger, which works great with the genuine Olympus batteries. Seriously, pay the $60 for the Oly batteries, two of them outlast 4 of the generics, and they hold on to their charge when not in use much longer, and you will know when to swap a depleted one out before your camera shuts off. ## Frequently Bought Together - Olympus BLH-1 1720mAh Rechargeable Lithium-Ion Battery for E-M1 Mark II Camera (Replacement) - SanDisk 128GB Extreme PRO SDXC UHS-I Memory Card - C10, U3, V30, 4K UHD, SD Card - SDSDXXD-128G-GN4IN - Olympus OM-D E-M1 Mark III: Pocket Guide: Buttons, Dials, Settings, Modes, and Shooting Tips (The Pocket Guide Series for Photographers, 14) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/37315676-om-system-olympus-blh-1-rechargeable-battery-black](https://www.desertcart.co.uk/products/37315676-om-system-olympus-blh-1-rechargeable-battery-black) --- *Product available on Desertcart Great Britain* *Store origin: GB* *Last updated: 2026-04-23*