So I put some Claptons in my RDA and they read at around 0.128 on my smok alien but at 45 watts the amp is 20.3 and I use dual Samsung 25r and I was just wondering if its safe to use because I'm not sure if the amp draw is supposed to be that high or not , or what wattages I can safely run them at
On a mech mod, the resistance is critical in determining the amperage draw on the batteries. But... on a regulated mod, it's the watage "requested" that is the prmary factor. True... lower res almost always means more power applied, but that's an almost perfect example of "correleation does not equal causation".
And there's debate over which newer mods have moved away from the industry norm of displaying "amps delivered (at the coil)" and gone to "amps drawn from the battery", which is far more useful IMO. So for now, that's not a displayed parameter I'd rely on.
In general, and if you don't feel like doing the math or being overly precise... if you have genuine batteries, not ridden hard or abused... a ballpark maximum is 60 watts per 20 A CDR battery (the amps drawn are distributed across all the cells). Adjust the math for other CDR ratings... 75W per 25A cell, 90W per 30A, etc.
But... it will flat your batts in no time.
Carry spares, or stay somewhat lower. Say 45 watts per 20A cell for regular usage.
You could easily go double that on your dual cell Alien, regardless of the coil's resistance.