A:AnswerNo, the Apple silicone macs (m1/m2 and their variants) use unified memory. Apple specifically says that the memory and the hard drive are not user accessible. There’s some articles online that show you how, but you’d be voiding the warranty.
A:AnswerThunderbolt is mainly USB-C, except it can transfer daata much quicker, which is great for using external monitors through USB-C or using an external dock.
A:AnswerAnecdotal for sure, but I didn’t charge it at all for the first three days. Without any heaving lifting this battery lasts longer than any laptop I’ve ever had, but I’m doing fairly light work with it. J