Can 5v 1amp charger charge a 2amp battery?

A 5V 1A charger can charge a 2Ah battery, but it will take longer than using a charger with a higher current rating. The charging time can be calculated by dividing the battery capacity by the charging current. In this case, it would take 2Ah / 1A = 2 hours to fully charge the battery.

It's important to note that using a charger with a lower current rating than the battery's maximum recommended charging current may result in slower charging speeds and potential battery damage if the battery is frequently discharged below its recommended voltage level. For optimal battery performance and longevity, it's generally recommended to use a charger that matches or exceeds the battery's recommended charging current.