I was wondering if you can use any kind of rechargable batteries as long as it's the right size, or does it have to be the ones you can only find on mod e-cig websites? Also, can you use ones with a different mAh? My Spade came with 2 triple AAA sized batteries that are 600mAh, so can I use 800mAh? And last question: Can you use any kind of rechargable battery chargers?