Crazy supplying a kit like this with only 1 battery and at 3Ah it'll be marginal in the circ saw and grinder. I did find an extra 3Ah battery on ebay for £57 and even a 4Ah battery plus charger for £59, but then noticed both have zero stock. https://www.ebay.co.uk/itm/372247866319 https://www.ebay.co.uk/itm/372217976768 If you can find spare batteries at a reasonable price and don't mind being restricted to a minor range of tools then this could be good value but I'd be wary. I'm not aware of compatibility with other battery systems; helpful if someone knows otherwise.
Spare batteries listed by a few places but ALL out of stock. Unless you can confirm that this is compatible with some other, available source of batteries it should definitely be avoided.
Great value, Wolf stuff are usually good quality
Stupidly cheap for what you are getting there. However would be an expensive paperweight when (not if) the battery fails. Or you get unlucky with a faulty charger. It would render the whole kit useless as you couldn’t get spares. Amazon stock some items from the kit but battery is “Currently Unavailable”. First listed in 2015 as well so I wouldn’t hold out hope of it coming back in stock. They might be compatible with other brands batteries - work, einhell etc but no way of knowing without experimenting. Couldn’t find any comments saying as such and you’ll be highly unlikely to find a battery adaptor. Cheap, yes - but there are far better ways of spending money in the tools market. Go get a Ryobi or Einhell which are fantastic value for money, are decent long standing manufacturers and importantly have a broad range of tools that the average home user would actually get use from. For example - you can use the drill battery with a cordless strimmer, grass cutter or hedge trimmer.
I've got a wolf corded multitool and have used it a lot. It's held up well certainly well made. I can't comment on their battery tools, which may prove difficult or expensive to get spare batteries for.