Nice one Hridge
Is it hard to remove the protection circuit? Does it ruin the battery?
So does does this mean US383759 is for European players:
http://worcell.com/product_info.php?products_id=74618?osCsid=529f9ade248eb92ab0d6f706d320b04d
And US453759 for Japanese units? Or other way round?
The OEM battery didn't have the protection board soldered, it was factory spot welded, and it teared off really easy, so the battery isn't affected more than some parts of the tabs are broken off.
If the protection board is soldered on, then it does not affect the battery at all if you desolder the board, provided that you do not run your soldering iron too hot of course.
The link you provide shows a battery without the protection board, with visible tabs, and that battery probably fits any ZX1, but it won't work without a board.
I'd like to attach an image or two but I can't seem to be able to upload images (missing the "Image button which appears as a yellow square with mountains and a moon")...so I'll try to explain it.
The protection board is soldered or spot welded on those protrouding tabs and then it's folded 180 degrees
Plastic protection is then wrapped round the top part of the battery and 3 wires stick out from the board, red for power, black for ground, white for control
I used a scalpel to separate the plastic so I managed to open up the new battery without damages, and that battery had the board soldered, so I just had to desolder that board.
Then I put on some fresh solder on the B+ and B- terminals on the OEM board because they were clean due to them being spot welded.
Then resolder the OEM board, turned the other way around to have the B+ and B- correctly fit.
Gently folded the board 180 degrees. The reason they are produced that way is probably to make them shorter, by folding the board over the tabs it becomes shorter. You will see how this is done when you open the OEM battery.
Closed the orange and black plastic protection.
Mounted the battery, backside up to get the wires in correct pos.
Solder on the wires, pcb board has legends for + and - terminals.
Test and hope for the best.
The battery I got was the black one with ref "US453759" written on it, and it didn't work, and my ZX1 is from my guess a EU version...so I conclude that US453759 is Japan or something else, not EU. The EU battery should read "US383759"...and if someone plans to source a working battery then you have to make sure that you buy a "complete" US383759 that has the protection board fitted. At least this is what I think from my own tests.
If someone could tell me how to actually add images I can add a couple of images of my OEM battery, in a disassembled state.
I have read the site description of how to attach images, but I do not seem to have that possibility, probably because I'm a new user.
I registered here just so that I could share my experience, because I think that the ZX1 deserves to be fixed and used, so ask more questions if needed!
If you google "3.7 protection board" and look at images you will find a lot of batteries where the board is visible thru yellow plastic protection, it might give you a hint of the task.
My recommendation is to not assume that a new battery won't work, solder it on and try before you decide to swap the protection board.
About the rubber removal, first I tried a small screwdriver but noticed that it might scratch the body, I ended up using a scalpel.
You only need to get a part of the rubber lifted so that you can put in a plastic tool and go from there.
It's thick rubber and it seems to be able to cope with a lot of stress.