A couple of Friday links of interest. Firstly, the Nseries blog guys have put together a nice little piece looking at the various battery technologies used by Nokia over the years, from Ni-Cad to Li-Poly - interesting to see just how much more efficient the modern cells are! Secondly, of interest because of Symbian's traditional expertise in this area, Andre at the My Nokia blog has written a comprehensive look at the way multitasking does (and doesn't) work in Windows Phone Mango, the version Nokia will be using next year in many of their upcoming smartphones.

"But the search for longer talk time and a shorter recharge time continues, and since 2008 there’s been a new contender on the block. The Lithium Poly Ion batter or Li-Poly offers up to 40% more battery capacity than the NiMH battery of same size and is totally free of the memory effect. And because they don’t need a cell casing, they’re ultra light. "

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"The agents are also broken into two categories, “periodic” and “on idle”  though developer applications can contain either or both of these. Periodic agents are run in periodic intervals of 30 minutes for 15 seconds apiece one after the other when the screen is on but pretty much in parallel when the screen is off. If the user is running 10 applications that require agents, you’ll have a situation where every half hour your apps may poll the CPU or network for 2 1/2 half minutes to cache information, sync data, check message servers etc. What wasn’t made absolutely clear was whether the applications are all on a single schedule or whether they’re independent in their polling (personally prefer the latter)."

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