(updated:06/20/16) Upgraded version: Now support dual micro-USB input in case your power bank does not support solid >2.4A current. A combination of 2A+ 1A or 1.5A x 2 should work in this case. If your power bank support >2.4A (recommend 3A), no need to use both ports. For power bank: Tested to work with Anker PowerCore 10400, 16000, and Hyper PS QD5-20000 with single input. For wall charger: Tested to work with Aukey PA-U35. The dual micro-USB can also be used to change power bank on the fly without turning off the camera. (buyers of V1 please contact me for the upgrade option if you would like to.) Currently working on the versions for the Sony NEX/A7 series and Canon EOSM. I would like to hear from you if you would like a mod for other cameras~! ----------------------------- Posted this in the accessory thread previously but would love to have more exposure and discussion with other users. I happened to wanted a Micro-USB dummy battery for my Olympus E-M5 ii. But there is limited option available on the market. So I went ahead make one by myself. The case is modeled myself and 3D printed. The circuitry is designed based on LM307 to ensure stable voltage output. (7.6V) Compatible with cameras using Olympus BLN-1 battery such as: OMD E-M1, E-M5, EP-5, I, II. This can be used in combination with a portable charger, or a USB power supply to power up your Olympus camera for long time usage scenarios such as: Time Lapse, event shooting, Firework Photography, Slow Shutter Photography, or Star Photography. I believe nowadays a micro-usb based dummy battery is more useful than a DC port one as you can share the portable battery used by your cell phone! I can now hook up my powerful external battery and never worry about battery drain during long exposure again~! Input: Micro-USB port, 5V and 2.4 A (Recommend 3A). Note: Your camera may not power up if your USB port cannot provide >2 A of current. The mechanical shutter need >2.4A to be functional. Electronic shutter works fine with 2A. Note: Don't use poor quality usb cable. The cable need to be thick enough and with good connector to deliver 2.4 A. I used the Anker 10400 mAh portable battery as an example to connect to this dummy battery. Inserted into my E-M5 II. Note that you do break the waterproof of the camera in this case. Camera powered up by the dummy battery and the portable power Sample photo 1 Sample photo 2 Sample photo 3 Since I still have some spare parts here. I am willing to make some more in case anyone need it, too. If you don't have the time to build one yourself, you may consider getting one from me. Shipping is included worldwide by paying through pay-pal: PayPal Please leave a note with your shipping address, or email to email@example.com The case is 3D printed so please expect some surface patterns. If you have some better idea or would like one for other models of camera, kindly let me know~! ------------------------------- For people who may be interested. There is similar but excellent work done by faithblind earlier. Olympus OM-D BLN-1 Dummy Battery by faithblinded 3D Printable OM-D BLN-1 Dummy Battery: Olympus SLR Talk Forum: Digital Photography Review He has provided some tutorial on how to make one yourself if you are careful enough and like the DIY fun~! Though I have not aware of that before posting my work. I am happy to repost my work as a remix of faithblind's work. As you will find, except the idea of 3D printing and using connectors, there are also some differences between the two work. The case was modeled from scratch and the idea of micro USB circuiting for using power bank and wall charger.