I love my Thompson very much, but for the battery, I got a 8.4V Large, with 4200 MaH. Just know, that my battery is about 3mm too large to close the stock. So it had the butt plate sort of open... however, it's not a huge problem because the butt plate stays in it's place.
Just saying, getting that battery in for the first time took a bit of effort.
Great gun, though.
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