4 ms·>30 min to 80% charge That's impressive. But why does it take 60 minutes to charge the last 20%?by josu 12y ago>30 min to 80% charge That's impressive. But why does it take 60 minutes to charge the last 20%?kevingadd 12y agoTo put it really simply: Batteries are nonlinear. Charge/discharge rates vary based on the current amount of power stored in the battery.josu 12y agoThat makes a lot of sense, thanks.