As far as I can tell, the battery functions very well as it's barely been charged more than a handful of times over the years, but I haven't done much more before preparing for sale than charging the phone, trying but failing to get it unlocked (again) and having a quick look at the basic functions/apps - many of these may now be out of date, so I can't take any responsibility for that, as it is a legacy phone without current manufacturer support. It will be carefully packed and shipped, reset to factory settings. There's an identical phone also listed, with just a very slightly different plastic case.
Any questions, please don't hesitate to ask. And do take a look at my other listings for more "vintage" mobile phones in good condition plus many other interesting, unusual, useful and well-priced items