Cordless(!) Planers

Your friend is possibly using cheap batteries. My batteries get daily trade use and get charged most of those days. I’d expect them to last a few years, so that means several hundred cycles. Generally I use the tools 'till the battery goes flat. No issues. The early no-cad batteries had to be treated carefully but the new Lithium batteries are really good.
It is moot really though as I agree you’re better to get power to your shed. I mean you also have to run your lights somehow.

Hey storm I tries a Bosch cordless years ago and without a box full of batteries you won’t get through a shape. I loved in Cornwall up until moving to aus in sept so know all about the risks of running power cables in damp conditions. If you can fit a semi permanent extension may be along a fence then that would be best. I’d run to through some plastic conduit which you’ll pick up at b&q. If not just go buy a  heavy duty extension with a breaker switch on it and use that. Just make sure at each end the cable is running upwards to your socket/extension and there is no way water can track up to it. Then use all the money you’ve saved to buy a better quality chorded planer. Cheers rich

Don’t throw away your old batteries, that won’t hold a charge.  They can be shocked back into service. 

Interested…how do you shock them

back?

There’s heaps of pages on the Internet devoted to restoring old batteries. One method is to stick them in the freezer. Another is to hit them with a hammer. I haven’t tried any of these myself. I guess if your battery is stuffed then you don’t have anything to lose by giving something a try.

Freezer works ocasionaly for nicads.
The makita lion batterys have a shut off when they get to low, reads off one cell and wont let them be charged so it’s best not to run them down and leave them flat.
A battery powerd jigsaw is great for cutting out templates and fins

Yeah, I reckon a battery jigsaw would be cool. I used to have a battery circular saw until someone stole it. Very useful for carpentry.