While I wouldn't want to do it, if it's not making you sick then you're safe (or as safe as we ever are with vaping and nicotine, which is probably pretty safe). Since we're inhaling nicotine as opposed to drinking it, it's actually rather hard to overdose in a dangerous way. Inhaled nicotine takes effect so quickly that it'll make you so miserable you stop vaping long before it becomes a real problem.
Signs of too much nicotine:
- Hiccups (yes, seriously, at least for some people)
- Nausea
- Headache
- Dizziness
If you get some or all of these symptoms, stop vaping. It should take about 20 minutes to process it. When you start feeling better, lower your nicotine and try again. That's about all there is to it.
Probably. When you're asking about batteries, it's best to list the model number. I expect you're using an LG HG2, since it's a very common battery that fits your description. In any case, you can use a 20 A battery up to 60 watts (although if you were vaping at 50 - 60 watts regularly I'd recommend something else.) At 20 - 30 watts, the HG2 is one of the most appropriate batteries you could be using. The Samsung 30Q and Sony/Murata VTC6 would also be suitable.
Two warnings about batteries:
- The advertised CDR is often inaccurate, so be careful about trusting it. I don't think it's a problem in your case since the LG HG2 really is rated at 20A.
- There are a lot of counterfeit batteries around, so it can be hard to tell if your purported LG HG2 really is an LG HG2. The best way to deal with this problem is to buy all batteries from a reliable vendor. You'll find a list of good ones at the bottom of this page.
