So, according to Wikipedia and BatteryUniversity.com, I should deep-cycle my iPod touch’s lithium-ion battery by depleting it completely and then letting it charge up all the way. Since I haven’t bothered to deep-cycle in the last few months, I thought I should deep-cycle my iPod’s battery again because this should be done every 30 charge cycles.
Now, completely discharging an iPod touch is hard because it automatically shuts down when the battery gets to around 5 percent. But I’ve discovered a way to really deplete the battery.
How I did it
First, I turned up the brightness all the way while my battery meter was showing red. I played some games (mainly Bejeweled and Cro-Mag Rally) and downloaded podcasts. Video podcasts. Pretty soon, the device just flat-out gave up. It didn’t even bother with a shutdown, or even a hardware-level shutdown. The system just cut power to everything. How do I know this? The LCD screen, instead of instantly going black, went black slowly as each pixel returned to its default position. (Sorry I have no pictures, I didn’t intend on writing a blog post until afterwards.)
Next, I waited a few minutes before trying to turn my iPod touch on again. This gives the battery some time to recover and appear to gain some charge. Now, the iPod started up again, but before it got to the Home Screen, it turned off again. I repeated this until it wouldn’t start. Then I did it again.
The last time I tried this, instead of getting a black screen with a shiny Apple logo, I got a light blue screen. No, not a BSOD. I’m not really sure what it was, but a few seconds later, it went black again. This time, I thought I’d done something terribly wrong, and that possibly I had permanently damaged my iPod touch. Looking back, I think it might’ve been a kernel level thing? I don’t know, but if you do, leave it in the comments.
At that point, I decided it would be a good idea to plug my iPod in. I painfully waited a few minutes, not knowing if I’d have to take it to an Apple Store. Luckily, the Apple logo showed up, and within a minute, it was ready to go again.
It was interesting seeing the LCD screen slowly fade to black, and seeing a blue screen instead of the familiar Apple logo. Although it’s probably not a necessary to deep-cycle a battery on an electronic device like I did, you could try it, and be sure to send us photos. Direct them to firstname.lastname@example.org. Thanks for reading my story about an iPod touch battery!
Update: I forgot to mention this the first time around: Extreme deep-cycling like this actually reset my time to January 1, 2000.