You can probably find a brand new/used 300 on ebay for nearly the same price of the replacement battery. When my 350 wasn't holding a charge anymore I also was considering replacing the battery. Luckily, before I ordered the kit I attempted to actually remove the dead battery first. My battery refused to budge no matter how much force I applied to it. I then opted to purchase my PRS T-1 for $50 instead of attempting to go through the hassle of replacing my 350's battery.
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