Lost battery tab

Discussion in 'SJ7' started by RBEmerson, Dec 6, 2017.

  1. RBEmerson

    RBEmerson Active Member

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    Those little black plastic tabs, for pulling out a battery, strike me as a material failure waiting to happen. Sunuvagun, one of mine broke off today.

    Has anyone else lost a tab? Has anyone come up with a work-around? Right now, my best guess is to use two loops of upholstery thread, at either end of the battery, to tug the battery out.
     
  2. kamkar1

    kamkar1 Well-Known Member

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    No i have not lost one of those, but i have been thinking that might happen one day due to the batteries fit that tight in the camers.
     
  3. RBEmerson

    RBEmerson Active Member

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    Agreed - the tabs struck me as not the best idea. Too bad they didn't, as an example, a cloth tab.

    If a battery does get stuck from swelling, all I can think of is to run a small screw into slot of the tab and pull on the screw. Since a swollen battery is automatically no longer safe to use (*), I'm not too worried about the screw making a mess of things.

    (*)The odds of the battery failing catastrophically are extremely low but pressure on the cells is one thing that can short them out internally. At that point the cells short out and quickly become hot enough to ignite the lithium. Explosively.

    DO NOT POUR WATER ON A LITHIUM BATTERY FIRE!


    While the battery is exploding, the fire is hot enough to disassociate the oxygen and hydrogen in water (water = H2O) which will make things exponentially worse. If the explosions are over, Halon or CO2, powder, or water can be used to put out the associated fire. If you think a battery might go, unless you have a Halon or CO2 extinguisher, let it go. BTW, Halon, being a fluorocarbon, can release fluorine gas when used in a very hot fire - fluorine gas is bad for all living things, including you.

    Have a nice day.
     
  4. TwoBlues

    TwoBlues Well-Known Member

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    I 've re-enforced all my battery tabs with pcs. of tough plastic pkg.tape because of battery's tabs that broke loose!
    'common problem with all my action cam batteries that have tabs!
     
  5. RBEmerson

    RBEmerson Active Member

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    Photos? I thought about putting on a tab made with Gorilla Tape or racing tape, but any pull to get the battery out will probably pull the tape off of the battery. Or am I missing the obvious again?
     
  6. sjcam_official

    sjcam_official Well-Known Member Manufacturer

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    Ya, actually please share photos so we can share with factory. if your unit is really reaching 57c we may need you to ship it back for replacement.
     
  7. RBEmerson

    RBEmerson Active Member

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    57C and it's repeatable. I think this is best handled under support ticket #23620
     
  8. sjcam_official

    sjcam_official Well-Known Member Manufacturer

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    Great. We will have a reply to you today.
     
  9. RBEmerson

    RBEmerson Active Member

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    I've started another test run, with the time & date stamp on. I'll post frame grabs from the video to see a) how hot the camera gets and b) how fast the temperature rises.
     
  10. rubiroza

    rubiroza New Member

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    @RBEmerson
    Did you get any reply?
     
  11. TwoBlues

    TwoBlues Well-Known Member

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    They're in their weekend. No reply 'til monday.
     
  12. RBEmerson

    RBEmerson Active Member

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    Yes, I did. The full exchange from their response forward:
    ADDED: Photos to follow here, too.
    [​IMG]
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    [​IMG]
    The support response is, for me, a mix of absurdity and "blame the customer for using the product". To say I'm losing faith in the SJ7 and SJCam isn't unreasonable.
     
  13. rubiroza

    rubiroza New Member

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    If camera's body is too hot to touch, please turn the unit off and let it cool down before using it again. :) :) :)
    Best answer I've ever heard. Way to go SJCAM support.
    Only solution for overheat problem is to put our camera into box and buy GoPro :(
     
  14. RBEmerson

    RBEmerson Active Member

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    OK, kids, let this be a lesson for you... Don't do drugs. You'll wind up saying something silly like that support(?) ...um... individual did.
    [​IMG]
     
  15. kamkar1

    kamkar1 Well-Known Member

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    Dont know about current ones, but the GP4 i think was also plagued by heat issues as i recall.

    Sure metal can conduct heat, it cam also trap heat, if you want it conducted the best thing are to have the heat generator touching the metal to facilitate transfer of heat as optimal as possible.
    But that just bring you half way there, the metal in turn have to offload that heat to something, in most cases air, and to do that optimal you will need a steady flow of air over the metal, and to further increase heat transfer you need as much surface area as possible.
    This is why you see computer CPU coolers have a lot of fins to increase its surface area by a large factor, the pickup point from CPU to the cooler can be small but exchanging from heat in the metal of the cooler to air you need a larger surface area as its a less optimal to transfer heat into air.
    This is why water cooled computers are a step up from air cooled, its the same rules in play but transferring heat into water are more easy, but you still need a radiator to transfer the heat of the water into air.
    Again here whit water cooling you can go passive, but its way less effective so you will see much higher temperatures.

    In general i find that with computers and say comparing a 2 fan ( 120 mm ) heat pipe cooler to a water cooled setup with a dual fan ( 120 mm ) on the radiator, you can in general get off with running the fans on the radiator at half the speed the fans need on a air cooler to get the same temperatures, and amping things up with overclocking the CPU mean the water cooled rig can go further up in CPU speed.

    Off course you can go passive cooling on a computer CPU too, but you at least need a heat pipe cooler then, to use liquid / gas in the heat pipe to aid in heat transfer, and then you probably have to use a CPU that dont generate as much heat.

    To my knowledge no action or dash cameras have the main heat generator ( the SOC ) directly in contact with the chassis, this might even be a bad idea as you will have a direct heat path so at least some point of the chassis could become almighty hot.
     
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  16. RBEmerson

    RBEmerson Active Member

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    It's a tough situation. Basically, features make heat, the case can only dissipate so much heat before reaching a balance between heat in and heat out. Right now the point of equilibrium is around 135. There it is.
     
  17. rubiroza

    rubiroza New Member

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  18. RBEmerson

    RBEmerson Active Member

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    Great thanks for posting that link!! It's very helpful!

    Would please you post that on the SJCam site, too?
     
  19. rubiroza

    rubiroza New Member

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    Posted.
     
  20. RBEmerson

    RBEmerson Active Member

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    Good on you(*). [/smile]
    (*) US western colloquial expression
     
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