Ewincher 2 features a removable battery, which means that there is the option to have an extra battery if needed. However the autonomy of the battery gives enough power in most cases, so an extra battery isn’t always advisable. We don’t advise it for boats shorter than 45 feet.
To give you an example: on a 40-foot cruiser, with one charge of the battery you can hoist your main mainsail 3 times AND do 35 tacks (sheeting in the genoa only with Ewincher), which is for most users enough for a day of sailing. Then the battery charges in 1h30 on both the 12V and the 220V.
Anyway there is always the possibility to buy an extra battery later if needed.