350W 990F Cordless Heat Gun (Tool Only)

I mainly use heat gun to heat up labels on packages so I can remove to see what the item description is. It takes about 10 seconds to warm up and roughly 20 seconds before you feel max heat. It seems to me that it runs down a battery pretty quick, it don't matter if you leave it on or turn it off after use about 20 min all you gonna get on a 4ah battery and maybe 10 on the 2 ah battery. For what I use it for its acceptable but it kind of feels like the fan motor is pushing harder than the heater. So unless you use it pretty constant your going to have that drag of heat up time each use unless your using before it completely cools