The problem you may have with an RDA on a pipe is leaking (especially if you are running dual
coils).
Are you new to mech mods and rebuildables? If so:
1. Do you have an ohm reader and a voltmeter or DMM so you can measure your builds, check for shorts and measure the remaining charge on your batteries?
2. What battery are you using (brand/mAh/amp rating)?
3. What brand of charger did you get?
3. Have you read up on battery safety, ohms law, amp draw?
If not, you need to do some homework before you begin rebuilding.