How the calculation works
Time = energy drawn ÷ charger power, where energy drawn = battery × (target − current) ÷ efficiency.
Frequently asked questions
Why does fast charging slow down near 80%?
Cars reduce power as the battery fills to protect it, so the last 20% takes longer.
Does the car limit charger power?
Yes. Your car’s maximum AC or DC rate caps the speed even on a stronger charger.