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BMMCC 14.8V Battery Module by RADIOPROEKTOR

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  • #16
    Looking good!
    Cheers

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    • #17
      ...and some final design touch. Also done some changes to internal aluminum frame.



      All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

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      • #18
        Hey Shijan, it's Eliott, i've bought pretty much everything of your items and always been very satisfied!

        About the battery,
        If I can use it for worldwide traveling (means allowed in airplanes), then you can put me on the waiting list right away. I'll probably buy a couple to try it and if satisfied, again 2 more. This seems like perfect solution for my kind of use.
        BTW I'm way more interested in the cheese plate version, which seems safer to me. Did you plan any quick release system or maybe something already on the market from SmallRig?

        Regards

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        • #19
          Originally posted by EliottG View Post
          Hey Shijan, it's Eliott, i've bought pretty much everything of your items and always been very satisfied!

          About the battery,
          If I can use it for worldwide traveling (means allowed in airplanes), then you can put me on the waiting list right away. I'll probably buy a couple to try it and if satisfied, again 2 more. This seems like perfect solution for my kind of use.
          BTW I'm way more interested in the cheese plate version, which seems safer to me. Did you plan any quick release system or maybe something already on the market from SmallRig?

          Regards
          I plane to create interchangeable mounting plates for it: LP-E6, Sony NP-F, and V-Mount. All compatible with common cheese plates holes pitch so you can screw that plates to other camera gear if needed. Mounting plates will be 3D printed. I also plane to share 3D models of those plates for free, so if you break or lost it, you can quickly print new part locally.

          Rear shell will be 3D printed from hard rubber material Elastan D70. It is very durable, and shockproof.

          To avoid problems with airlines shipping regulation Batteries will NOT be included in the package. So you can start to seek for 18650 unprotected batteries in your local stores. SAMSUNG INR18650-30Q or SONY US18650VTC6 30A or Panasonic NCR18650B 3400mAh (unprotected) are recommended. It will cost you about $20-25 for 4x battery kit.

          Battery is 44.4 Watt Hours (if use 4x 3000 Mah cells) , no any problems with traveling (100 Watt Hours limit). Also if needed you can always easily open the enclosure, remove 18650 battery cells and put them to safe place.

          Charger also will be optional. If you already own 16.8V DC Charger for V-mount battery, you can use it with this battery. Any 16.8V 1A or 2A DC Charger from ebay will work with it. They costs about $5-10.

          If things goes well, first assembled samples will be available in 4-5 weeks.


          P.S. As a simplest and cheapest QR system you can just use Arca Swiss.
          Also you can can just screw SmallRig Super lightweight 15mm RailBlock v3 942 to it and clamp to the rods.
          Other options:
          A MiniMart makes very compact Mini Rapid Quick Release Plate http://www.aminimart.com/mini-rapid-...led-light.html
          SmallRig makes nice NATO clamps system.
          Slidekamera also makes ultra compact V-Mount system https://www.slidekamera.com/v-mount-...plate-set.html




          I also checked total weight. Probably it will fit to 350-450g (full kit with batteries). It feels rather lightweight in hands and seems it will not overload LP-E6 mount.

          Last edited by shijan; 05-12-2018, 10:42 PM.
          All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

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          • #20
            That tiny ON/OFF switch comes in Black and Red colors.



            All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

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            • #21
              Originally posted by shijan View Post
              That tiny ON/OFF switch comes in Black and Red colors.



              Hello, Shijan
              It looks very nice!

              I pre-orderd new Pocket. But I still love my Micro

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              • #22
                Thanks for your previous answer and.. Black all the way!
                This is obviously a stupid question, but will I be able to power my SmallHD 502 which is 7v? All I see is 14.8v ports and the BMMCC through DC is only 12v. I need some explanations

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                • #23
                  You will need a regulated dummy battery to power the 502. I use the IndiePro one to power my 501.

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                  • #24
                    Originally posted by EliottG View Post
                    Thanks for your previous answer and.. Black all the way!
                    This is obviously a stupid question, but will I be able to power my SmallHD 502 which is 7v? All I see is 14.8v ports and the BMMCC through DC is only 12v. I need some explanations
                    I was thinking to add additional regulated circuit to output 7.4V, It costs about $1-2

                    But this makes things more complicated and may add additional problems. Some step-down converters are not well compatible with some specific devices that require specific regulated power. Probably this problem needs separate research.

                    12V for BMMCC is average voltage, it can accept up to 20V, it compatible with any V-Mount battery.
                    As Denny Smith told, SmallHD 500 series needs regulated LP-E6 adapter. SmallHD makes its own adapter but it is expensive. It is probably the dumbest thing about SmallHD 501 monitor. I was lucky to find secondhand SmallHD adapter for my monitor. There are also cheaper OEM LP-E6 regulated adapters on ebay, but they are designed for DSLR cameras so cable will extend from top.


                    P.S. i just found better battery holders for this project. They have thicker pins and can hold higher load. Overall quality seems better. So i will do some redesign again.






                    Also finished the design of internal support parts. They will be 3D printed from simple ABS plastic.
                    Additional step-down voltage boards are too large and don't fit here. So i keep it as simple 14.8V battery.
                    As you can see additional Balancing Board may fit near the main board, but i need to check if it make sense for small 4s battery pack.





                    Probably i'll move design to new PCB. This is CF-4S30A-A protection board with build-in Balance circuit. Very powerful, not too expensive. It is also designed for better cable management, easer to solder and mount.


                    Last edited by shijan; 05-20-2018, 11:38 AM.
                    All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

                    Comment


                    • #25
                      Power consumption measurements:
                      BMMCC = 7.75W (8.06W during recording)
                      SmallHD 501 monitor (100% brightness) = 6.9W
                      Total average power consumption = 15W

                      Battery Module average output 14.8V x 3.4A = 50Wh (watt-hour)

                      50Wh : 15W = 3.33 hours total (or average 3 stable working hours until battery voltage drops under 12-13V safe limit)

                      Voltage meter indicator:
                      4 LED lights - voltage is greater than 16V
                      3 LED lights - voltage is greater than 15.2V
                      2 LED lights - voltage is greater than 14.4V
                      1 LED light - voltage is greater than 13.6V
                      No lights - voltage is under 13.6V, but battery still have about 15-20% of usable emergency capacity.
                      Keep in mind that output voltage varies a lot depending of battery load.
                      Over discharge protection circuit switches off battery cells only when voltage drops under 10.2V, but to avoid battery cells degradation it is recommended NEVER discharge under 12V.

                      Battery cells FAQ:
                      To avoid problems with Air Mail shipping, battery cells will NOT be included in the package. You need to purchase 4x 18650 sized UNPROTECTED lithium-ion battery cells somewhere in your local electronics store. Those battery cells are very common nowadays and will cost about $20-25 total.
                      Do NOT purchase batteries from unknown sources and unknown online sellers.
                      Do NOT purchase cheaper OEM 18650 batteries labeled with something crazy like "4000mAh" or more. Those are fake and crap cells.
                      Do NOT mix different battery cells with different capacity, different brands or different age.

                      Some useful comparative 18650 battery tests:
                      https://endless-sphere.com/forums/viewtopic.php?t=91821
                      http://lygte-info.dk/review/batterie...comparator.php
                      https://www.youtube.com/watch?v=Qpm91Itv6k8

                      Recommended highest capacity (3400mA) 18650 batteries:

                      SANYO/Panasonic NCR18650GA
                      BEST CHOICE! Maximum continuous load 10A. Normal charging current 1.675A. Maximum charging current 3.35A. Quality brand, low price, slightly extending positive pin friendly for battery holder. Made in Japan. Released in 2015.

                      Panasonic NCR18650GA
                      Same as SANYO 20NCR18650GA but made in Panasonic China factory branch.

                      Panasonic NCR18650B
                      Maximum continuous load 6.7A. Normal charging current 1.625A. Released in 2011.

                      Samsung INR18650-35E
                      Maximum continuous load 8A. Normal charging current 1.7A. Maximum charging current 2.0A. Released in 2015.

                      SONY US18650VC7
                      Maximum load 8A. Normal charging current 1.0A. Slightly overpriced compare to others, sometimes hard to find. Released in 2016.

                      LG 18650 MJ1
                      Maximum continuous load 10A. Normal charging current 1.7A. Maximum charging current 3.4A. Released in 2014.

                      LG 18650 M36 INR18650 M36T
                      Maximum continuous load 5A. Normal charging current 1A. Maximum charging current 2.33A. Released in 2017.

                      Recommended lower capacity (3000mA) 18650 batteries:

                      Samsung INR18650-30Q
                      Maximum continuous load 15A. Normal charging current 1.5A. Maximum charging current 4.0A. Released in 2014.

                      SONY US18650VTC6
                      Maximum continuous load 15A. Normal charging current 3.0A. Released in 2015.

                      Charger FAQ:
                      For request i can add charger to the package, but currently i have very limited amount of chargers with EU plugs in stock.
                      Any existing 16.8V 1-2A CC/CV (Constant-Current/Constant-Voltage) charger will work.
                      Some battery cells require 1A, some 1.7A normal charge current. For rapid charging some modern batteries may support maximum current up to 4A, but they may became very hot during that extreme charging. Higher charging current = faster charge = quicker battery degradation, but i think it is not a problem when you can just put new battery cells inside this box after 500 full charge cycles (1-3 years of usage). 2A probably the safest and most optimal speed vs quality charging current. Just to be safe and simple - do NOT use charging current larger than 2A.
                      Here are nice series of recommended 16.8V chargers. They have recognizable design and quality internal parts. Ask seller for DC plug 5.5x2.1mm and AC plug type depending of your location.



                      DC power connectors compatibility FAQ:
                      It is very odd and irrational, but there are two almost similar DC power connector standards walking between devices all around the world: 5.5mm (outer size) x 2.1mm (inner size) and 5.5mm (outer size) x 2.5mm (inner size).
                      5.5x2.5mm plug usually fits to 5.5x2.1mm socket but connection may be not too perfect if plug appears too old and outworn.
                      5.5x2.1mm plug do NOT fits to 5.5x2.5mm socket.
                      It is better to use plug connectors with inner center spring contact. They better hold center pin mismatches.



                      DC input power socket connectors compatibility list:
                      BMMCC/BMMSC original expansion breakout cable - 5.5x2.5mm
                      BMCC - 5.5x2.5mm
                      BM Video Assist - 5.5x2.5mm
                      BMPCC - 2.5(2.35)x0.7mm
                      OLR Lite Breakout Box - 5.5x2.5mm

                      CGPro BMMCC/BMMSC Breakout Box - 5.5x2.1mm
                      SmallHD 500 series DC Faux LP-E6 Adapter - 5.5x2.1mm
                      SmallHD DP series - 5.5x2.1mm
                      All Atomos 7” recorders - 5.5x2.1mm
                      Angle Breakout Expansion Box by RADIOPROEKTOR - 5.5x2.1mm
                      Battery Enclosure Module by RADIOPROEKTOR - 5.5x2.1mm
                      Juicebox Magic Power - 5.5x2.1mm
                      ikan VL5, VL7, VH8, VK7(i), VX7(e,i), D5(w), D7(w), and VX9(e) monitors - 5.5x2.1mm
                      ikan iLED144, iLED-ONE, iLED6, iLED312(-v2), ID(B)508 LED Light Units - 5.5x2.1mm

                      Alternate Quick Release mounting systems for this battery:
                      Compact size Arca Swiss Clamps ($15)
                      Flat Manfrotto 200PL QR clamp by FotoPanda ($12)
                      SmallRig Super lightweight 15mm RailBlock v3 942 ($10)
                      SmallRig NATO Clamp 1885 ($40)
                      SmallRig Handgrip Rosette Adapter ($39)
                      SmallRig S-Lock Quick Release Mounting Device 1855 ($36)
                      A MiniMart Mini Rapid Quick Release Plate ($13)
                      KONDOR BLUE Mini Quick Release Plate ($20)
                      POWRIG DSLR Monitor Quick Release Plate Adaptor ($20)
                      POWRIG Quick Release Plate Mount 1700-H Adaptor ($21)
                      Slidekamera ultra compact V-Mount system €85.00
                      Wooden Camera V-Lock Base Station and Wedge Kit ($125)
                      Oben QRA-R2 Quick Release Assembly with RP-20 Plate ($30)
                      Cameo V-Lock Kit ($150)
                      Velbon QRA-3 B Mini Quick Release Adapter ($25)
                      CAMVATE Quick Release V-Lock Base Station And Wedge Kit ($57)
                      CAMVATE V-Lock Base Station And Wedge Kit ($29)
                      Last edited by shijan; 09-30-2019, 10:11 PM.
                      All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

                      Comment


                      • #26
                        Awesome design (as always)! How much do you plan to sell this for? And when will it be ready?

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                        • #27
                          Originally posted by LJR View Post
                          Awesome design (as always)! How much do you plan to sell this for? And when will it be ready?
                          Hope it will be ready in about a month. I still wait when some electronic components arrives. I need to make real life measurements. They are almost here. Hope this week i'll be able to place an order for CNC manufacture and 3D printed parts.
                          Expected price $100 (without battery cells and charger), but i still need to check 3D printed parts manufacture cost.

                          Package will include:
                          - Battery Enclosure Module with removable rear shell (18650 battery cells are NOT included in the package)
                          - Removable passive Canon LP-E6 type connection base
                          - 3pcs 1/4"-20 3/8" length button head black oxide screws
                          - 13cm DC power cable with 5.5x2.1mm angle plug connector
                          - 29cm DC power cable with 5.5x2.1mm angle plug connector
                          - 29cm DC power cable with 5.5x2.5mm angle plug connector (for request)
                          - Optional 16.8V 2A charger


                          Ultra short 13cm DC power cables will be factory manufactured specially for this project.
                          29cm DC power cables are common, and available in retail online stores.

                          No V-Mount and Sony base plates yet, but i'll share 3D print files for free later, so you can print it in any local 3D print service, if needed.



                          This is also final design of LP-E6 base plate. As you can see, the plate is slightly different from classic LP-E6 batteries because optimized for 3D printing and for specifics of BMMCC LP-E6 mount plate. It has partial empty cellular structure inside to save some weight and some plastic material during 3D printing.
                          Last edited by shijan; 05-14-2018, 05:07 PM.
                          All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

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                          • #28
                            Awesome! I'm sure it's more complex, but having the LP-E6 sled be active would be a dream...

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                            • #29
                              Originally posted by LJR View Post
                              Awesome! I'm sure it's more complex, but having the LP-E6 sled be active would be a dream...
                              Active LP-E6 is impossible task for DIY made, it is too technological and needs real factory mass manufacture. Also those LP-E6 electronic contacts are so tiny and feels not too reliable. Always feels like not designed for long lasting battery. Sony battery mount design feels better and more reliable.

                              Cable management example:




                              Tech Specs:
                              Aluminum alloy enclosure (factory CNC machined and anodized in black color).
                              Rear cover shell (3D printed from hard rubber-like shockproof material ELASTAN D70).
                              Internal support parts and Connection Base are 3D printed from ABS Plus or ABS PRO plastic.

                              TENSTAR ROBOT CF-4S30A-A BMS (Battery Management System) board:
                              Built-in balance circuit provides 100% uniform and equal charge of each battery cell
                              Continuous discharging current: 30A max.
                              Charging voltage: 16.8V
                              Charging current: 30A max. (2A recommended for this battery pack)
                              Overcharge protection
                              Over discharge protection
                              Over current protection
                              Short circuit protection

                              Voltage meter indicator:
                              4 LED lights - voltage is greater than 16V
                              3 LED lights - voltage is greater than 15.2V
                              2 LED lights - voltage is greater than 14.4V
                              1 LED light - voltage is greater than 13.6V
                              No lights - voltage is under 13.6V, but battery still have about 15-20% of usable emergency capacity.
                              Keep in mind that output voltage varies a lot depending of battery load.
                              Over discharge protection circuit switches off battery cells only when voltage drops under 10.2V, but to avoid battery cells degradation it is recommended NEVER discharge under 12V.

                              LUMBERG 1614 09 DC power socket connectors 5.5x2.1mm (5.5x2.5mm compatible). Support up to 2A 24V
                              Blossom Electronics dual 18650 Battery holders
                              CANAL ELECTRONIC MRH10-C5N-BBN ON/OFF Rocker Switch. Support up to 10A 250V
                              16AWG connection wires with high temperature silicone insulation. Support up to 10A 300V
                              22AWG DC cables with 5.5x2.1mm angle power plug connectors. Support up to 2A 24V
                              Output voltage range: 10V min., 14.8V normal, 16.8V max.
                              Average total battery capacity: 50Wh (capacity depends of installed battery cells)
                              Dimensions: 84x82x62mm
                              Weight: average 300g (excluding Batteries), average 500g (including Batteries)
                              Last edited by shijan; 05-18-2018, 10:38 AM.
                              All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/

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                              • #30
                                I like your open looking design Shijan, looking forward to getting one soon.
                                Cheers

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