I just got a Kanger Dripbox 160 today and im really exited to use it. The only other mod I have owned is the smok g priv and I know almost nothing about RDAs. My question is how do I know im not over charging my batteries. Im using the pre installed coil in the RDA but im not sure how many watts I should be using to be safe. The mod says the resistance is .3 and I think I used a calculator correctly and I got 45w. I however dont know how many amps my battery is and the only information I got from is is "18650 3.7v 2500mahh" I want to make sure im being safe when I use it and can understand how to be safe when I start building my own coils. Thanks to anyone who takes the time to help me with this.