Today's Apple laptops provide outstanding battery life in comparison--anywhere from four to eight hours on a single charge. But if you need even longer run times, the fact that the batteries in the current MacBook, MacBook Pro, and MacBook Air models aren't swappable may have you looking back to those days of external power packs.

The problem--as I --is that Apple refuses to license the MagSafe power connector, that little magnetic tip that lets your MacBook's power cable safely detach, instead of damaging the laptop, when you trip over the cable. Without a MagSafe connector, external battery packs can't work with recent Apple laptops.

The only solution is for ...and that's exactly what Sanho has done with the company's . To produce each HyperMac battery, Sanho actually purchases a $79 Apple laptop power adapter and surgically extracts the MagSafe cable for use with the battery.

As we , Sanho offers four different models: