Compared with Ni-MH batteries, Lithium batteries still have a longer lifespan. However, Ni-MH batteries have two disadvantages. One disadvantage is that the charging time is particularly long, and the other is that Ni-MH batteries are both It has memory, and it can be recharged after the power in the battery is discharged. Unlike lithium batteries, which can be charged at any time, this is the most troublesome problem.