Using an F series battery in a S series?

[roebeet]

My S60 battery, like others on this thread, is not lasting as long as I'd like it to. I noticed that the F series players use a similar size and plug for their batteries, but they are 4V instead of the S series' 3.7V. I did a quick test on my S player to test an F series battery on it, and the battery did work. But, has anyone used an F series battery for an extended time on the S series? I'm concerned that the voltage difference might damage my player.

Thanks, Brian

[saratoga]

The battery voltages are the same, and I've heard of people swapping Ipod4G batteries into both F and S gigabeats without trouble, so it should be fine.

[roebeet]

So far, so good (adding a F40 battery to my S seriies). It's a tad thicker, so it's a bit of a tight fit. But, it's working and the battery is noticably longer. Thanks!