Internal heat is just as bad. When the processor is severely loaded it emits more heat that is bad for the longevity of the unit. To avoid this remove the battery(strictly when it's off) and use the computer on AC power if you expect it to run processor or GPU heavy applications.
The lithium stocks canada tools battery is unique the tool's power does not diminish as the battery power runs low. There is full uniform power all through the battery runtime.
Now you need to determine what type of batteries you will need. This is based mostly on lithium ion batterty stocks your budget and time till land variable. In other words, how long do you want to fly for and still get performance.
Any tool that is cordless needs to have some source of energy. The Milwaukee C18 drill driver comes with 2 rechargeable lithium ion batteries each with 18v. The 2 batteries can be used interchangeably i.e. as one is being charged, the other can be used. This means that the tool doesn't need to lie idle because of cobalt ontario canada lack of a source of power. This is one of the great features of this tool and many other cordless tools that the Milwaukee Company produces.
Some cordless drill models have two batteries, so while one is charging the other can be used to power the drill. If you are going to be using a drill for hours at a time, then having two batteries on hand will really come in handy. The last thing you want is for your battery to die right in the middle of a project, and then having to wait for it to charge. If you see a cordless that you want to buy but only comes with one battery, just order another.
In other parts of the world, however, they haven't been so lucky. Europeans have been experiencing gas prices between $5-$8 per gallon for years. But they still get around. Common among their usual transport is a bicycle. You've seen many pictures of common folks getting around town bicycling. Kinda like what we did when we were kids. To get more "mileage", a lot of Asians and Europeans use hybrid electric motor bikes.
One final consideration with RC gas planes converted to electric. You always need to factor in cooling of the battery pack and esc. In fact many modelers, including myself, put the ESC on the outside of the plane, usually I mount it under the engine on the firewall. You also need to make air vents to cool the battery inside the model. Without this, you run the risk of overheating batteries and ESC's.