Thread: BMMCC 14.8V Battery Module by RADIOPROEKTOR

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  1. #21  
    Junior Member Antithese's Avatar
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    Quote 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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  2. #22  
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    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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  3. #23  
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    You will need a regulated dummy battery to power the 502. I use the IndiePro one to power my 501.
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  4. #24  
    Senior Member shijan's Avatar
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    Quote 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 at 02:38 PM.
    All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/
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  5. #25  
    Senior Member shijan's Avatar
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    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.

    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
    Flat Manfrotto 200PL QR clamp by FotoPanda
    SmallRig Super lightweight 15mm RailBlock v3 942
    SmallRig NATO Clamp 1885
    A MiniMart Mini Rapid Quick Release Plate
    POWRIG DSLR Monitor Quick Release Plate Adaptor
    Slidekamera ultra compact V-Mount system
    Wooden Camera V-Lock Base Station and Wedge Kit
    Oben QRA-R2 Quick Release Assembly with RP-20 Plate
    Cameo V-Lock Kit
    Last edited by shijan; 09-22-2018 at 11:13 AM.
    All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/
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  6. #26  
    Awesome design (as always)! How much do you plan to sell this for? And when will it be ready?
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  7. #27  
    Senior Member shijan's Avatar
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    Quote 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 at 08:07 PM.
    All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/
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  8. #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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  9. #29  
    Senior Member shijan's Avatar
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    Quote 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 at 01:38 PM.
    All my custom made accessories for BMMCC/BMMSC now available here https://lavky.com/radioproektor/
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  10. #30  
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    I like your open looking design Shijan, looking forward to getting one soon.
    Cheers
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