The only thing that annoys me is the fact Apple made replacing its battery an almost impossible task. It is not a big deal if you live in the US where a new kit or just the sensor are fairly cheap. But, if you live abroad like I do, it might cost a lot of money. For instance, in Brazil, a new Nike+ iPod Kit costs a lot more, due importing taxes and currency exchange rate. Steel, a battery costs much less than the kit itself.
Luckily, I found this post explaining how to open and replace sensor's battery. My post is solely to endorse those instructions and share my personal experience while doing so.
1. Opening: by far the hardest step. The instructions I mentioned above does not emphasize how hard and tricky this step is. I used a very sharp knife and after half an hour and a lot of patient, I was able to open it up.This guy used a very hand sawing tool. Either way, you've got to be careful. If you go too deep, you may ruin its internals circuit.
2. Removing the battery. At very first moment, I thought it was some sort of special battery as I could see 4 wires coming out. But it is not - the thing on the top of the battery is just a component you have to take off of the battery's surface. Using a sharp knife, I removed some the plastic protection. As the instructions I mentioned above says, a plier might be handy in order to remove terminals from the battery (they are soldered):
Sensor uses a regular watch's battery (model ref. is CR2032) which provides 3v. I didn't have one sitting around and I would have to drive to the nearest store. I ended up wiring up two piles together so I could test whether the battery was actually the reason why the sensor was not working anymore.
And it worked like a charm.
UPDATE
3. Placing a new battery and closing sensor up: I just bought a new battery. I removed old metal terminals and soldered directly to the battery:
4. Closing the cover: Just place everything in nicely and carefully. I used some electric tape in order to avoid accidental short circuits.
Instead of glueing it together again, I used some electric tape to put the closer caps together. That makes my life a lot easier next time I need to replace the battery.
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