I bought one of the NewPower99 replacement batteries for my 300 about a year ago, because I was needing to charge the reader every other day. I asked a friend with more nimble fingers to install it for me.
No, the battery wasn't glued down. Be careful with the tiny plastic pieces on the seal at the top of the case, by the power switch. You can see them in the video if you look closely. My friend accidentally broke one. It didn't make an operational difference, although the seal doesn't fit quite as snugly on the top as it does on the side and bottom now. The reader works just fine, and a charge seems to last just as long as the original did when new. I bought it through Amazon; the seller was Innovate88. I hope this helps.
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