[0.135 lb] Anyone using a Canon EOS-M for videography can attest that you need to bring extra batteries for your shoot or plan on having short shoot times. Using the Tether Tools Case Relay Camera Power System will extend your shooting times into hours instead of minutes. The system will include the appropriate battery coupler for the EOS-M. You'll just need to provide an dummy battery for the EOS-M that can be found here: https://www.bhphotovideo.com/c/product/883409-REG/Canon_6785b001_DC_Coupler_DR_E12_for.html You will also need an external USB battery. Tether Tools sells a very good one here: https://www.bhphotovideo.com/c/product/1235869-REG/tether_tools_rsbp10_rock_solid_10_000_mah.html Extend your shooting times for videography, stop-motion animation, extended time-lapse photography with the Tether Tools Case Relay Camera Power System!

[6.6' / 2.0 m] Coupled with the camera appropriate cable, this system works great. If you do long time-lapses it is a must have. If your external power-pack is running low simply switch it to a new one without the camera losing power. I'm probably going to pick up another system for my wife's camera.

[0.135 lb] Perfect with the adaptor !

[0.135 lb] excellent product, well made, works fine, would recommend to friends.

[0.135 lb] I've just purchased a second Case Relay system as it is so good. I highly recommend this system as a rock solid way of powerering cameras for endless hours. I've recorded non stop 4K 100Mbps on my GH5 for over 10 hours and including in over 30 degrees C heat, and this system works perfectly. I've done this dozens of times and it always works. The camera sometimes shows full battery and sometimes shows 2 of 3 bars but never below that. I've used several power banks and two different phone chargers to power it, and hot swapping worked perfectly. Only one small cheap power bank refused to power it, but I wasn't surprised or disappointed. In between shoots I will sometimes power up the camera for a few minutes without providing a power source, and the internal battery in the Case Relay copes with the load and it doesn't lead to any bad consequences during the next day of shooting. If you do time lapse or long videos or just don't want the hassle of switching out batteries, I highly recommend this amazing gadget!

[0.135 lb] Needed to set up a D500 so a presenter could record 2 half hour presentations a day for 2 weeks without me being there. We did a couple of dry runs and I realized I didn't want the be swapping batteries every day. That required 4 of my 7 EN-EL15 batteries, 2 in the body-grip and 2 charging, plus me stopping by every day and the chance of accidently changing focus or framing. Nikon was out of stock for their AC adapter and I really didn't want to put a $25 power supply in my camera unattended for 2 weeks. Found this from Tether Tools and decided it was what I wanted. Worked great, used a 3 amp USB charger to power it up and just left it. Checked it when I swapped drives in the recorder but never did anything to it, worked great. I did gaff tape the connection to the battery adapter just in case, something better than a barrel connector would be nice since if it got yanked on everything would stop.

[6.6' / 2.0 m] I used this for my videography project especially during the ceremony where I need to use an external battery for extra duration. It works perfectly! Definitely a real life saver when you can just leave the camera rolling at all time.

[0.135 lb] Allows me to hook up to an external battery so I can capture the upcoming solar eclipse from beginning to end. Great product, wish I had it sooner.

[7.9 x 4 x 1.5"] I use this for long timelapse sequences of 3-5 hours or more. The ability to change external battery sources is a great benefit. The product is light weight and durable.

[6.6' / 2.0 m] Who woulda thought of such a simple camera UPS system using consumer USB batteries?! This so perfect for long events and timelapses. I only wish that the Sony mirrorless cameras would record for longer than 30 minutes at a time and it would be a totally hands-off long recording setup. The only problem I ran into was that the a7sii we used it with would sometimes incorrectly detect its battery being almost depleted and wouldn't allows us to format the next card to use. So we had to turn off the camera, take out the dummy battery, put in a normal battery, turn on, format, turn off, take out the normal battery, etc. but hey. It's a third party universal power item. Can't expect it to work perfectly with every single brand :-)