How many batteries does it take to connect more than 400 voltages in parallel?

The voltage of parallel mode is unchanged, but the capacity is increased. If the voltage is to be increased, it must be connected in series. The voltage of an ordinary battery is 1.5V, and 400V requires more than 260 batteries in series. You can change the connection mode of electrical appliances according to the purpose, and adopt the series-parallel connection mode, which not only reduces the use voltage, but also reduces the use amount of batteries, which is more convenient and safe.