does this come with a case?

No, it did not come with a case, but I'll tell you this, it is a great chainsaw. I did order two new chains from Oregon Chains. The one it comes with only has about 19 cutting teeth. Oregon chains doesn't sell that one. It's only sold to suppliers as to make the chain saw cheaper, though it did okay. I made about 50-60 cuts before my new chains came in. The new chains have about 28 cutting teeth and do a terrific job. The original chain still has some life in it but I prefer using the new chains. Love this chainsaw. I also bought an extra battery so I could cut for about 30-45 minutes and then switch to the other battery for another 30-45 minutes or so. Depends on how big and hard the wood is you're cutting. It does take about 90 minutes to recharge. But what a difference over using a gas chain saw and having to constantly restart it. With this saw, you just squeeze the trigger and when not cutting, it's off. I highly recommend it.

Does this come assembled? Would I be able to hold and use it with bad arms?

You have to drape the chain around the 'blade' then lay it in place before turning a plastic dial to tighten it down. That's the only 'assembly' required, and it's extremely simple. Once that's in place, there's another plastic dial to turn to tighten the chain. You must also buy chain lube oil as it does NOT come with it. It's about $4 at any WalMart or Big-Box store like Home Depot. Obviously, you have to charge the battery first, too. As to your arms, I'd have to know how bad 'bad' is. I'd say most adults could easily use it although it could be difficult to hold it up at eye level (or higher) for 'weaker' people where 'weak' is another word that has such a broad meaning it's almost worthless unless you have something to compare it to. All I can say is this thing is a total workhorse. I've made HUNDREDS of cuts with it and never had a problem, even when cutting a tree with a 14" diameter at the trunk. I love it and am extremely happy with mine. A neighbor saw me using it, and he bought one, too. He's 76, has no problem using it, and loves it. So unless you can't hold up 12 pounds or so for any length of time, it _should_ be okay.

Will the charger work on 220v input?

I just checked the charger unit and it is rated for 110 to 120 VAC. My unit was shipped to an US address so I can't say what would be shipped to the UK or other places with similar electrical standards.

Is there a weed eater that uses the same battery?

Do not buy their weed eater....oh,r you will find out why.....the mother board may got out after you use this 4 or 5 times....they have your money, you own junk, cost more to fix it than its worth..

Brand	WEN
Power Source	Battery Powered
Horsepower	3.5
Item Weight	12 Pounds
Product Dimensions	32"L x 9.5"W x 8.5"H
Chain Length	16 Inches
Chain Speed	49 feet_per_second
Manufacturer	WEN
Part Number	40417
Item Weight	12 pounds
Country of Origin	China
Item model number	40417
Batteries	1 Lithium Ion batteries required. (included)
Style	Tool + Battery + Charger
Item Package Quantity	1
Included Components	40 Volt Chainsaw^Battery^Charger
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Ion

WEN Cordless Electric Chainsaw, 16-Inch Brushless with 40V Max 4Ah Battery and Charger (40417)

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