I just received my i35, very nice, but from the first start, I have the ‘no battery is detected’ message.
Now I must decide about my options, if going for a refund, a replace, or attempting to fix by myself, and isn’t easy at all, given the price I paid, balanced for the shipping to Spain and relative delays.
So far, I have only found a comment (on this forum) saying the ‘battery is sealed’. Should I assume then I cannot change the battery by myself?
I had the same problem and only recently found a replacement battery for my Thinker. You can search for it on Aliexpress using the search terms:
5000mAh Battery for ALLDOCUBE Cube Thinker Tablet PC Kubi Li-Po
Replacing the battery is very easy. The original OEM battery body is held in place by screws so it’s easy to remove. Disconnecting the power cable is also very easy, just use your fingernails to gently wiggle it out. Putting the new battery in place is simple, it’s held there with black tape that the seller gives you. So yes, you can replace the battery.