Erratic iPad The other day when I arrived home I found that my iPad2’s battery died. As usual, I connected it to the charger and did not find anything abnormal. The next day after I got up, I attempted to use my iPad to read some news. To my great surprise, it was still charging and I could not even start it up. Anybody who has ever used an Apple gadget knows that it only takes a few minutes for an iOS device to start up automatically after being charged. Given that my iPad had been charged for a whole night and could not boot up, there had to be something wrong with it. I tried pressing the Home button and the Wake/Sleep button simultaneously for a few seconds, but it did not work out. Then I searched online, trying to find out whether someone had had the same experience as mine. Indeed some people had had similar problems and posted their problems on some forums to look for help. Unfortunately no satisfactory answer had been offered. Dismayed, I contacted the online retailer from whom I bought this device. Unexpectedly he said such a thing was impossible. Why would I lie to him? Anyway, I gave up on him. Then I found the Apple tech support number and called it. Seemed this was my last hope. After hearing the description I gave to him, the technician told me to do those things I had already done. Hence nothing exciting happened. Finally he asked how was the weather like in my place and what was the indoor temperature. I was like “What? What does the temperature have anything to do with the malfunction of a renowned digital device?” Anyhow I told him that the indoor temperature was around five degree centigrade (41 degree Fahrenheit). He replied that the ideal condition for an iPad to be charged was between 10 and 30 degree centigrade (50 - 86 degree Fahrenheit), so it was possible that my iPad’s problem had been caused by the low temperature. On hearing this, I thought this was like a big joke. Five degree is a daily normal temperature here in winter. How can a prevailing gadget be unable to work under normal condition? I have an iPhone1, the oldest version of iPhone. I have been using it for nearly four years and it is still functioning pretty well except for imprecise battery percentage display. The phone has fallen down accidentally for innumerable times and I even dropped it into the water once. Therefore, it was not reasonable for me to hope that higher temperatures would bring my iPad’s life back.

Is this sentence idiomatic ? 他活了大半辈子：He has finished/completed the most part of his lifespan (or life?). I've searched on google, but it seems nobody have ever used such an expression,thus making me wonder whether the sentence is idiomatic. If not, what is the proper way to express the meaning? Answers would be highly appreciated. Thanks in advance.