There were hopes that the battery would be a welcome addition in case the electricity was cut off or if you needed to temporarily store it somewhere for a few hours. In actuality, you must wait until the battery is charged if the battery is drained in order for the mains to turn on. You can only turn it on at the first speed after that; however, it will intermittently turn off. I won't mention the second and third speeds because they are reduced, and you must wait at least 30 minutes for charging. This is stated in the guidebook itself, so I believe this is not a marriage. This is a big negative in my book because the battery will eventually run out of power or break down.
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