I used my ego c upgrade with a piece o .... smoktech LR atty now it's all ....ed up and doesn't produce as thick of vapor as it used to. So I'm in the market for a new battery. I wish I could get some nice ... $200 mod like an AR with some crazy long lasting battery and high quality rba. But I'm a poor college kid who's broke as ..... I want the battery to have variable voltage at least a 1000 mah and be able to vape it while its charging(is that what passthrough means?) I can get an ego c twist for like 18 bucks free shipping on eBay with a tank. Or just replace what I got for around 30 or get a vision spinner for 25 free shipping. I wish I could graduate from egos and find a mod with variable wattage for under 40 but I don't think that'd be possible. Any other pen style batteries I'm missing that are better deals than what I just showed? A 650 that's adjustable and can be vaped while charging would be good if I can find one for under 20.