While the notion of a fixed power source in a pro laptop will almost certainly send the dueling-battery crowd into paroxysms of indignant rage, the performance of this particular battery pack may be worth the design trade-off, lasting as much as 50 percent longer on a single charge than its predecessors. How is that possible? With silver-zinc rechargeable batteries, which not only offer vastly improved run-time over traditional lithium-ion battery technology, but are safer as well. Recylable too. Over at Apple Ink, Seth Weintraub ably lays out the case for a silver-zinc-powered MacBook, leading one to think that the announcement of such a machine in the near future is pretty much an inevitability.

With the life of the 50-watt-hour lithium-polymer batteries topping out at five hours, my guess is complaints about a fixed battery pack will be few and far between if Apple (AAPL) can deliver nine hours of charge from a silver-zinc battery.

Now if it would only begin offering that matte screen option again…

[Image Credit: ZPower]