Unfortunately one of the pilots disadvantages is that they don't work at high altitudes. Turbo prop and turbo jet planes get around this with PACKs and bleed ai

Unfortunately one of the pilots disadvantages is that they don't work at high altitudes. Turbo prop and turbo jet planes get around this with PACKs and bleed air. To make a high altitude electric small plane you're going to have to make a mini Dreamliner PACK or carry tanks of liquid/gaseous oxygen.