I need help with general repair, upgrades, and case replacement of my old beat-up PSP-1000

[Umi-hebi]

I'm planning to repair my old PSP-1000 which is functionally fine aside from losing a few buttons and half the case when I stepped on it with these parts:

[url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320472082740&ssPageName=STRK:MEWAX:IT[/url]

And getting a few extended batteries:
[url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=110449517308&ssPageName=STRK:MEWAX:IT[/url]
[url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260503401159&ssPageName=STRK:MEWAX:IT[/url]

Now, I should be set, but there is one thing bugging me - the power switch.
It's functionally fine, but it's kind of rubbed off from use and I can't find a new one.

[img]http://imgkk.com/i/ThMwR_.jpg[/img]

Does the new replacement housing come with the external power switch or where can I find one?
When I search 'PSP-1000 power switch' all I come up with is the internal parts.

Also, are the batteries legit?