There are so many different chargers in the market, why some charger use 5V or 12V input while some chargers building 100-240V in inside the charger like building an adapter inside the charger?What’s the difference and which will you choose?
Pls help meeeeee
It all depends on, what batteries, and what type of batteries you want to charge. In addition, how many you want to charge at once. In general, a charger with a 5V/12V input doesn't have much power to charge four 18650 batteries at once, in a short period of time. A charger with a build in power supply, usually performs better. However, the build in power supply doesn't provide a lot more power either, otherwise the charger would become too bulky.
Speaking of
type of battery, when you need a charger for 2s-6s LiPo packs, that's even more complex.