Looking at visiting Canada for a couple of years... 110V 60Hz mains.
Is it worth taking any UK electrical stuff? - I have asked a couple of manufacturers about power tool chargers for the batteries - the response so far is that I will need compatible chargers to be able to run the tools - not looking good unfortunately
If you are concerned only about chargers for tools, as others have said, your existing charger
may be compatible and work at any voltage between 100 V AC to 250 V AC.
If not, it
may be possible to obtain 240 V AC (@60 Hz) in
many/most North American premises.
If you look at this diagram (
https://en.wikipedia.org/wiki/NEMA_connector#/media/File:NEMA_simplified_pins.svg) you will see that "Clothes Dryers" in North America usually operate on 240 V, using a NEMA 14-30 (or L14-30) socket outlet. (The "L" stands for "Locking")
If the "premises" concerned have a reasonably well equipped garage/workshop, there
may be NEMA 6-15 or 6-20 (or higher capacity) socket outlets.
(You should avoid NEMA 10-30 or 10-50 socket outlets, since no Earth is available from them.)
If, along with any "charger" concerned, you take with you a lead (or a power-strip) with a BS 1363 three-pin socket, you should have no problem in obtaining a suitable NEMA plug to suit any 240 V socket outlet available to you - and rewiring the BS 1363 lead/power-strip appropriately, after removing any BS 1363 Plug.
Just remember that your 240 V appliances do
not require the North American (centre tapped) "Neutral" - so (if available), do not connect it to anything.
However, any North American socket is most unlikely to have an associated switch, so both of the "legs" of the supply will be at 120 V AC above "Earth"/"Ground" at all times and any BS 1363 power-strip may "switch" only one of those "legs".
While North American "codes" seem to abhor the connection of most lower capacity (Amperage) devices to higher capacity circuits (except on circuits providing 15 A or 20 A), the fuses in your BS 1363 plugs (for which you may not be able to obtain replacements in North America) should obviate any objections in this regard.