They sold me an aspire brand one with it. Why is an external safer/why would they put in a cord if it was unsafe?
1800mah 40 a aspire sorry just checked.
from the research/ reading I have done, the internal usb chargers are not as safe or reliable as an external charger - some mods have even had issues with the charging port requiring users to take them out - there is a good bit of info on it here (try using search box and looking for 'usb charge' - should get you some info)... they would include a cord with it because it is a 'feature' - personally, i ONLY use the usb charger in a pinch (which is to say pretty much never - easy enough to keep a spare battery - in a case, not my pocket (that's a whole 'nother issue...) - but ultimately, the choice is yours - external chargers are designed specifically for charging, the charging port in your mod is an 'add-on'
i *believe* the aspire batteries are okay (though it is not, in fact, a 40 A cdr rating battery, regardless of what the label says... check out
@Mooch 's blog on battery bench tests)... I tend to prefer the samsung 25r in my subox - 2500mah 20amp cdr (you don't really need anything over a 20A in the subox as you won't be firing anything over about 13 amps given the limits of the mod - .3 ohm min/ 50 watt max power)