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Backup Battery Charger for iPhone 4,4G, 3GS, 3G ,iPod, iTouch-EXTERNAL, PORTABLE, RECHARGEABLE (Electronics) My Ipod Touch internal batrety has deteriorated to about 70% of when new. This little add-on is useful for extending up time about 40%. However, it does add significant dimension. It would not be feasible or advisable to carry it around with this batrety plugged in (fragile connection). It provides me exactly what I was looking for until I decide whether to spend money on getting the internal batrety replaced.