Can't you find a 505 battery replacement on eBay Argentina?
If so, then the video is on newpower99's site and the screwdriver should be obtainable locally, if you can't find an eBay listing that supplies it with the battery.
I haven't replaced mine yet, but have read some posts that say it is difficult. I imagine they didn't take enough care (it apparently takes great care) in disconnecting and re-connecting the ribbon cable and re-installing the back without damaging that cable.
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