BMMCC 14.8V Battery Module by RADIOPROEKTOR

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Dmitry Shijan

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 8:00 am

Pocket Cinema Camera 4K working time depends of camera settings. My calculated working time (not real life measurements):

2.2 hours (22W max. camera power consumption, high frame rates, screen at 100% and recording to a media)

4 hours at average 24fps camera usage. (this was taken from other brand 50Wh battery measurements).
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rick.lang

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 6:37 pm

Dmitry, after 150 messages, can you post one message (perhaps in message #1 for easier recall), that lists the links to all items needed to mount and connect your 4x18650 enclosure to the BMPCC4K or BMPCC6K cameras; perhaps connection to the internal Canon LP-E6, the 2-pin connector or USB-C connector as appropriate. A lot has changed over those 150 posts and the website only talks about the Micro cameras. Perhaps that info should be on the website too. Apologies if it’s already there! Thanks.


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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 6:46 pm

rick, just click on the product you interested and check info description here:
:arrow: https://lavky.com/radioproektor/
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 6:49 pm

Rick, you are alive and well! :roll: The accessories Dmitry has sourced out are a few pages up in this post. I agree, moving this info to the first post would be nice, to make it quicker to find. Sending you a PM.

Dmitry, nice list, thanks for the link and info.

Paul, I have not run a endurance test yet, just got the required cable the other day (PC4K accessory cables are hard to get right now, everyone is sold out or backordered. I found the Juice Link power cable on eBay and a Mic cable (which just got delivered) on Amazon, one of three left in inventory there. Both are non-BMD cables (which are just not available right now in USA that I could find) custom made cables. Wooden Camera has a DTap power cable available, but needed the one for Dmitry’s battery pack. When BMDs power cable pack becomes available (I have one on order, I will make up a power cable for Dmitry’s battery pack, using the slightly larger barrel connector). The Juice Link one works, but the barrel connector is slightly loose, but still makes a good connection.
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rick.lang

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 7:11 pm

Dmitry, I had looked at the description of the 18650x4 product previously and it’s all about the barrel connectors and the Micro cameras. A previous post a while ago mentioned your product can be used with the new BMPCC6K and BMPCC4K. I assumed you had a version with the proper LP-E6 dummy adapter or better a 2-pin connector to the camera or perhaps to the camera USB-C connector.

Denny has just posted he can modify a cable or use a BMD cable (which I’m still waiting for since January or February I think).


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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 7:21 pm

Rick, scroll down, the mounting adapters are at the bottom of the list. The LP-E6 mounting plate is just a dummy mounting option, designed for the Micro cameras, you need to run a power cable from the battery pack to the Micro camera power input (on the crazy dongle cable) on Dmitry’s DB breakout box.

The LP-E6 plate allows the battery pack (which is 16 VDC, so would not work directly coupled to the camera via the battery mounting plate as this is a 7.2VDC battery connection) to be mounted to the camera in place of the LP-E6 battery. Most of the Micro camera users wished BMD had used a Sonly LP style battery on the Micro cameras, instead of the Canon LP-E6, since it hangs off the back of the camera anyway.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 7:27 pm

rick.lang wrote:Dmitry, I had looked at the description of the 18650x4 product previously and it’s all about the barrel connectors and the Micro cameras. A previous post a while ago mentioned your product can be used with the new BMPCC6K and BMPCC4K. I assumed you had a version with the proper LP-E6 dummy adapter or better a 2-pin connector to the camera or perhaps to the camera USB-C connector.

Denny has just posted he can modify a cable or use a BMD cable (which I’m still waiting for since January or February I think).


The kit includes only cables and mounting plate for BMMCC/BMMSC. So it is up to you how to connect it to P6K or any other camera. To power BMPCC6K you need cable Barrel DC 5.5x2.5 (or 5.5x2.5) to Pocket4/6K Weipu connector. Sorry, i have no those cables in stock for some reason.

If Pocket4/6K can be powered with external USB-C, you can purchase DC to USB-C adapter converter and power the camera with USB-C port. I have few those adapters in stock as well. They can provide up to 48W power.

There are also dummy LP-E6 battery plates with build-in DC-DC regulator that can accept
up to 18V and output regulated 7.6V. For example Lanparte makes them. But those are rather expensive and not too effective because that additional DC-DC conversion wastes about 10% of battery capacity.

You can mount battery enclosure to rails block or with any quick release plate from the list in the bottom of item description in marketplace.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 7:29 pm

Dimitry thanks for the info on the estimated run times.

I think for use with the BMPCC4k, it would be important to be able to change 18650 batteries quickly without having to use a screwdriver. Maybe with a quick release? Then you could buy 12 batteries, have four in the module, four charged and four charging..
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 7:42 pm

It is possible, but do it at your own risk. You can just fix rear shell cap with rubber bands. I can even add few heavy duty rubber bands made of motorcycle camera for free for request.
I don't tested battery enclosure in this way, but i think that after few months of such intensive usage battery holder may wears and 18650 cells may wears as well. Changing batteries in the field like this takes too many times and may be too complicated.

I am personally skeptical about usage of this battery with Pocket 4/6K cameras. For all day work with those cameras you probably need at least 100Wh. So you may look for larger sized V-mount battery or use my batteries in parallel dual setup which will provide 100Wh.
Also in dual battery setup you can hot swap one battery.

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 07, 2019 8:43 pm

I agree Dmitry, I would not use it for long, or all day shoots, a regular 14.5VDC 100 or 150 watt battery would be better. But for short shoots under 2 hrs it should be fine.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 21, 2019 10:37 am

Next little batch of Battery Enclosures is almost assembled.
Changes:
- Slightly improved and simplified soldering of internal cables.
- For additional security all external soldering points now covered with special dielectric transparent paint.

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 28, 2019 8:06 pm

All,

So like Rick I was hoping this would be specifically available for the BMPCC4K. I also wanted to see a hot swap option for the batteries.

Like some others on here, I decided to build a simple DIY 4x18650 pack. It is crude, and I still havent done anything like velcro, etc to make it easy to mount. I have a long barrel connector to the DC input on the BMPCC4K. That is plugged in to the battery pack that has a female barrel connector.. and in turn the pack is wired in series. In total, $30 including 4 NCR/Panny 18650 protected cells. I used some electrical tape to tape up the soldered ends and thin wire leads between each cell. Again, not pretty but it does work.

With this I get a bit over 3 hours of recording 4K to the T5 SSD and the screen on. Mind you, this includes the 30 or so minutes the internal battery uses.

My point in this post so many months later is to first indicate that I could build a 2nd, 3rd and more of these super simple/cheap series wired 4x battery holders with barrel connector, and have them with me. When plugged in, it charges the battery in the camera. What is great is, I can hot swap these all day because when you unplug one, the battery in the camera takes over with no interruptions. It only takes a minute or two to grab a 2nd pack, plug it in and go.

Dmitry's offering is great.. though for the price and not being ready to go out of the box for the BMPCC4K/6K to me is not the way I would go at this time, especially when it is so cheap to build a simple holder + series wired setup. It isnt as professional, but you can for sure make it work.

Another member here talked about buying the bike lights.. they are about $20, they hold 4 18650 batteries, with a water tight screw lock that is easy to open and swap batteries. Only down side is they are in a 2x2 config, so it isnt enough power to power the camera. One of these days I am going to try to rewire it to be in series, but that is an ideal setup. Having a 2x2 "cartridge" similar to the cheap ones you buy to put 3 or 4 AA or AAA in to a C or D slot/conversion.. would be perfect with a cartridge receiver that has a couple power output options. It is a shame nobody has created one yet. I would think being able to quickly hot swap smaller and might lighter sets of batteries would be a lot more desirable than carrying around larger VMount batteries for most BMPCC4K/6K users. I can see on larger camera setups with tripods, dollies, etc where weight is handled for you, that the larger batteries make sense. But for gimbal users and those just rigging up a BMPCC4K/6K, a small 2x2 or 4x1 hot swap battery pack just seems to make a lot more sense. It gives 2 to 3 hours of record time, so it is not like you are swapping it out every 30 minutes and having to interrupt the recording.

Anyway.. if I had the 3D printer and the chops to make it work, I would consider doing what Dmitry has done but with a more hot swap capable option and in a 2x2 layout.
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Dmitry Shijan

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Sep 28, 2019 10:11 pm

If bike lights 18650 backs work well for you, just use it. It was discussed here earlier. I am not interested to make any specifically accessories for BMPCC4K because that camera form factor is not designed for modification or rigging. It is designed in Photo Camera form factor aka all-in-one solution to quick grab camera and quickly shoot something from hands or from tripod. It is ergonomically very limited and any further rigging or modification for this camera makes it look like ugly monster without any respect to 100 years of cinema camera ergonomics evolution.
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Leon Benzakein

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSun Sep 29, 2019 4:27 pm

I just recently purchased one of Dmitry's battery modules.
I do not have history using it so that will be up to those who have been using it to attest to that.

I can speak about the size and form factor.
It is relatively tiny and can be mounted very easily.

Anyone who has bothered to read my posts will know that I get some of my jollies trying to find solutions for attaching devices to camera gear.

Dmitry's device is a solution worth looking at.(speaking purely as a grip, at this point in time I cannot speak about how long it will keep powering)

I will be looking into swapping out batteries and how well it works in that fashion.

Dmitry, I need you to do us a favor. ;)
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSun Sep 29, 2019 4:59 pm

Just get two battery module units, their are less expensive than V or Gold Mount batteries. As for how long they can last, do the math... :roll:
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Leon Benzakein

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSun Sep 29, 2019 6:48 pm

Denny Smith wrote: As for how long they can last, do the math... :roll:



I wish I could be as smart as you. :ugeek:
Alas, some of us have to get by on our good looks. :roll:

I was standing behind the door when math skills were being handed out. :(
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSun Sep 29, 2019 7:01 pm

OK, you get about 2.5 to 3 hrs on a fresh charge, but actual time will depend on lens used (OIS draws more power), frame rate and recording codec being used. All these factors effect battery current draw.
For a comparison, my Ursa Broadcast went through a Gold Mount 95 watt battery in about 1.5 hrs.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostMon Sep 30, 2019 3:17 pm

I have PM'd Dmitry about my experience with the LP-E6 dummy plate and how it fits on the original VA 5".
He suggested that I post my findings on the forum.

I have found the LP-E6 dummy plate for the battery module a tight fit on the orig. VA 5".
It was designed for the BMMCC and BMMSC 4K.

Ambient temperature does affect the tightness of the dummy plate.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostMon Sep 30, 2019 3:23 pm

Leon Benzakein wrote:I have found the LP-E6 dummy plate for the battery module a tight fit on the orig. VA 5".


It is indeed a very tight fit, but note that there are two versions of the plate: one that is custom-fit to the BMMCC and an earlier one (which may or may not still be available from Dmitry) that was slightly loose on the camera. I've tried them both on the Video Assist and the looser one is a more "comfortable" fit on the VA 5". It's not loose, but not so tight that you'd worry about causing damage.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostTue Nov 12, 2019 5:04 am

Item still available.
UPS Express shipping costs are slightly lowered.
Also now i can provide UPS Express worldwide shipping to 100+ countries.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostFri Nov 29, 2019 6:11 pm

$95 BLACK FRIDAY SALE!
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Nov 30, 2019 5:44 pm

Well, I should have waited to get my second one :roll: The second battery module arrived last week, fitted the new batteries and it charged right up. Now I have one with the LP-E6 plate and one without to use on my Pocket 4K rig.
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Yannick Willox

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Nov 30, 2019 8:13 pm

Can someone confirm how the module behaves on the p4k ?
Does it go down to say 10%, and then switch off, before the voltage gets too low ? In which case the internal battery of the p4k takes over ?

At which voltage under load does it switch off then ?

Thanks.
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Dmitry Shijan

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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSat Nov 30, 2019 8:19 pm

It can be discharged up to 10-12 V, so you always use all possible battery capacity. LP-E6 are weak and camera cuts them off when they reach 40-50% of capacity. There is a separate thread with some battery tests of single LP-E6 cell vs single 18650 cell:
viewtopic.php?f=2&t=100567&p=569113#p569052
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostSun Dec 01, 2019 7:45 am

Ok, but that means that under load this battery module would work for, say 30-40 min below the min. 10.8 or 10.4 V spec of the p4k, until the external battery stops.

Did anyone test this on the p4K to see how the handover to the internal battery goes ? How long is the p4k in the red warning zone ?
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostTue Dec 03, 2019 7:14 am

Dmitry’s Battery module does not display percentages, it shows up as AC (in percent mode) or displays remaining voltage level. If you have a LP-E6 Battery in the Camera, the Battery module will be charging that battery and running the camera, so I start with a fully charged LP-E6, to get longer run times. Once the Battery module drops below its minimum discharge voltage level. It shuts off and camera continues to run on the LP-E6.

The only way you will notice this, is if you are using the percentage display mode, and it goes from AC to showing a battery percentage, or you watch the voltage level, and see it go from 12.X display to 8.X -7.X VDC display, showing you are on the internal battery. The Battery module does have its own battery level indicator, 3-4 green LEDs and one red LED, and once it shows only one LED, I would switch battery modules, or external power sources.

That said, for recording times longer than 2-3 hrs, you can use two of Dmitry’s battery packs connected together, or you might want to consider a larger V/Gold Mount Camera Battery.
Cheers
Last edited by Denny Smith on Fri Dec 06, 2019 5:13 am, edited 3 times in total.
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Re: BMMCC 14.8V Battery Module by RADIOPROEKTOR

PostTue Dec 03, 2019 8:42 pm

Thanks for the feedback.
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