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The Proton AA is a treasure found in Pikmin 2. It is actually a Duracell (National Hi-Top in the Japanese version) AA battery. This item is found in the fourth sublevel of the Submerged Castle, near some gas pipes and bomb-rocks held by Volatile Dweevils and Careening Dirigibugs. Olimar takes note on how it looks very much like the Courage Reactor, the first treasure he found in Pikmin 2.
The text on it reads:
The first paragraph contains instructions that warn the user to respect the polarity, and that the battery is not rechargeable. They are presented in Italian, French, German, and English, in that order.
“This object resembles the first treasure I found on this planet, so it holds certain sentimental value to me. However, I've just noticed that the size it slightly different. Sometime, I should take the time to read my previous treasure log book. It's good to reflect on the past sometimes...”
“Some enigmatic energy unknown on Hocotate is trapped inside: who couldn't use more energy?”
Names in other languages