Depends, Gerry, on how hard you're going to push it. I never vape over about 10.5 - 11 watts, so any 20 amp battery works for me. If you're going to go full bore, any that have a 30 amp continuous would be fine.
Flat top only, the compartment is tight.
I was wondering if you might be able to help me too?

Cloupor Mini 30W Features:
1. Size: 77.5mm*36mm*22mm
2. Output power: 7W-30W
3. Removable 18650 battery
4. VV/VW Mode can be switched manually * What does that mean? Please
5. vaping time counting ( 15S limited protection ) ???
6. Output voltage : 3.6V—7.0V What is this?
7. Max output current: 10 Amps
8. Can build on 0.45-3.0 ohm atomizer [ does not work with subtank .05 Ω -- would have to use the 1.2Ω coil instead ? ]
9. Adjustable 510 Pin
10. Ohms reading calculats to 0.01ohm <<<---- confused --- with #8 above
11. Reverse battery protection , no worry about installing battery improperly
12. Left & Right Mode
13. Magnet back cover,no need to use screwdriver,more convenient
14. Instead of screen lock, It can be turned off
15. Over charge protection
16. Colors: Black,Silver