Having retired all of my Air's, my Hypermacs are being used as basically big-ass USB chargers. And since I've bought the smaller USB-specific batteries from Hypermac recently, they're going to even be largely redundant from that role. I'll be unloading them shortly, but there are times I want that option of plug-in extra runtime without having to pick and choose which laptop battery I need to take with me.
The Hypermacs have, if I'm not mistaken, only two voltages they can operate at - which is presumably why they don't offer cables for other notebooks. A proper universal would have to support ~16-20V.
I would not be looking at anything too large, and would look to it only needing to power my ultraportables properly - i.e. 60-80wh.
Any suggestions?
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What's a GOOD universal notebook external battery?
I can't help you further with what a good pack would be but my word of warning would be to avoid any of the solutions offered by Duracell, I've had two different models of battery packs from them fail within 3 months of first use.
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