to
blkxiicat, my 1st stamina battery was bought during the time when the psp was only available in phat version.
cost was RM180 at sony store. the packaging was the sealed plastic type, not the paper box (Japanese) or like the pic triple posted.
my 2nd one was bought from play-asia in 2011, it was the Japanese paper box w/ 1 replacement back cover. was USD59.90 that time.
the battery isn't really a limited edition type, but it's like a typical 1 time restock item. once it's gone sony rarely If ever restock it.
you know la Malaysians, always try to find cheaper places to shop, sony stores are like premium type stores which never do deep discounts unless there's a clearance sale.
as for play-asia, in 2011 they were overstocking on stuff and always had cheap sales every now and then and gave out coupons like there's no tomorrow.
the battery was around usd69.90 and later on they chopped off usd10 and with coupons you could even save more...
also, I dispute your facts about battery charging. the ori psp charger will not overcharge your battery if you use the correct one
(the psp 3k had a smaller and less powerful charger, I don't recommend using the older bigger charger on the psp 3k).
I also had the stand alone psp battery charger:
this one is the 1st version (with built in flat 2 pin charger) and cannot fit the slim battery (unless you use a dremel to make the slot...).
I got it from japan w/o box, but it works on our 240V supply with a travel adapter.
but it's a slow charger, I think this is the reason why the charging is more 'accurate' from your angle?