The SJ4000 is a high resolution action camera comparable to the GoPro Hero....at a significantly more attractive price. I have 4 of them. They are very popular and there is a vast array of replacement and aftermarket (high capacity) batteries available for them. They are 3.7v, LiIo
So recently I bought a few of the "high cap" versions off ebay claimed to be 1000mAh and was very interested to know exactly what the capacity of these high capacity batteries actually was since I paid a premium for them. The standard OEM batteries are 900mAh rated.
Since there is no way to do this with the camera, I designed and printed a fixture that slips over the SJ4000 battery and makes secure contact with two wires which I can then connect to my Turnigy Accucell 6 to accurately test the capacity. What I found was interesting....and disappointing.
The two batteries were from an ebay seller known as candys-outlet-store.
Their feedback rating was very good so I purchased two EforTek batteries along with a charger for about $19.00
Upon making my adapter fixture and testing the batteries the result for battery 1 was 930mAh and for the 2nd battery only 830mAh (not even up to par with a standard OEM battery. Neither reached the advertised 1000mAh capacity. If I hadn't made the test rig and tested them I would not have known. At this point I can at least return them for a refund.
If you own an SJ4000,SJ5000,SJ6000,Geekpro,DBPOWER, or Gookit they all use the same battery
I will be purchasing high cap batteries from an alternate source after returning these. If I find a vendor who sells true Hi-Capacity SJCAM batteries I will post that back here later.