LilB281 This is a car audio amp designed to run at somewhere around 12-14v. You would have to get some type of converter to run this on a home 110v system. You're better off finding a home theater amp instead

BG493251513 I run mine on 3S once in a while with no issue. The 3S battery I have is also very big, it's a 3000mah 75c 3s battery, but I don't run it hard on it either I just use it when my 2S batteries are dead and I want to play with it. never had a problem with it getting hot or anything. just a note, I run my 144010 on a dumboRC transmitter and receiver because the throttle delayed on this stock unit is pretty bad honestly. I hope they can fix that soon, but in the meantime, if you have an extra transmitter and receiver laying around you might want to consider using it for it

BG493251513 on the 1500mah stock 2S I get at least 15 to 20 minutes of average play at the end of my driveway going through the street, sidewalks, and the little bit of grass in the easements. seems to have a great battery life

BG493251513 I actually have an 11.1V 3S 3000mah 75C battery that I'll run mine on once in a while if my 2S are all dead, and it seems to do well with it. I drive mine in the street and sidewalks so I'm not heating it up by going through grass with it, but it does okay on the road with 3S. I will say 3S is so fast on it that it's pretty much uncontrollable and will literally flip over from a wheelie every time if you try to take off too fast with the 3S installed

LilB281 I own the 144010 in stock configuration and own this exact upgrade kit for my 124019, and I can confirm the 3650 will definitely be a speed increase from the stock 2845 on the 144010, however, the difference doesn't seem to be astonishing or anything. I totally enjoy my 144010 with the stock configuration, and my 124019 is so fast I can even put a 3s battery in it on my neighborhood streets, it would be scary fast.

LilB281 The original brushed 550 does get very hot when ran hard. I ended up switching to a 3650 4300kv brushless motor with a 120a ESC, I can now run it for an entire battery using the stock 7.4v 2600mah batteries, and the motor barely gets warm at all. I kept the stock gearing and am really pleased with the results overall, no more worrying about motor heat for now!

LilB281 If I had to guess I'd say 25a. I run a 2s 7.4v 2200mah 25c lipo and it does great

LilB281 Not sure how the other brand you mentioned sound, but if you're ok with the sound quality of those other ones, my suggestion would be to go with them, not these Air Aux ones. The sound quality isn't terrible, but it has pretty much no audible lower end whatsoever. Anything lower than 120 or 130Hz is not present in their sound profile, not at least to a point in which makes any difference for the average user. I was definitely disappointed considering they are said to have 13mm drivers. I have a pair of earbuds with a 6 or 7mm driver that have incredible low end, but these 13mm have none at all