what is the highest Psi?

It's rated for 150 psi / 10.3 bar. More info at http://uk.ryobitools.eu/power-tools-en/fix-finishing-tools-en/r18i-en/r18i-en/

How long can you run this, a) could you do 4 Tyres from flat say 30 psi,? b) would a 1.5Ah battery cope or would you need to replace before complete

I use mine to inflate my Motorbike tyres (37 and 42 psi) and rarely need to recharge it, so I would imagine it would not have any problem doing four tyres up to 30 psi on one charge. I'd put money on it being able to do that at least twice if not three times over.

Is this suitable for suvs ? the extra weight of them generally prevents compressors from working.

This is actually a good question. Being a Ryobi tool I would expect it would be able to, cheaper models should also be able to although they will probably be slower. Anyone who thinks the weight of a vehicle has nothing to do with tyre inflation is clearly a fool or has never inflated the same tyre on and off the same vehicle!...... (the tyre inflates much faster off a vehicle or if the car is jacked up slightly)

Do you have to screw this onto the tyre thread of a vehicle or is it a pressure valve you hold in place like the petrol station tyre Inflaters?

No need to thread it on, if you look inside the pump nozzle it's pretty clear. Just push it on, then after a small hiss of escaping gas depress the lever. Use the power button to choose your preferred\desired pressure scale, as indicated by the lit panel & blow! Sorry inflate, really handy & portable.( Takes all the pressure off you while you put the pressure on)

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Description

🚀 Pump up your productivity with cordless precision!

INFLATE ON THE FLY - Cordless 18V power lets you pump up anywhere, anytime.
COMPACT ORGANIZED - Wrap-around hose storage and onboard accessory holders keep your workspace clutter-free.
LIGHTWEIGHT DURABILITY - Aluminum build at just 1.8 kg means rugged reliability without the bulk.
SPEED MEETS CONVENIENCE - Rapid 5 LPM airflow and quick deflation mode save you time on every job.
PRECISION PRESSURE CONTROL - Digital display with auto shut-off ensures perfect inflation every time—no guesswork.

The RYOBIR18I-0 ONE+ 18V Inflator is a lightweight, battery-powered inflator featuring a fast 5 LPM airflow, digital pressure readout with automatic shut-off, and quick deflation mode. Designed with wrap-around hose storage and onboard accessory holders, it offers cordless convenience and precision for inflating tires and large inflatables up to 150 PSI.

Specifications

Manufacturer	Ryobi
Part Number	5133001834
Product Dimensions	26.7 x 169 x 200 cm; 1.8 kg
Item model number	R18I-0
Size	Sans batterie
Colour	Green
Style	Wrap
Material	Aluminium
Pattern	Generation I
Power Source	Battery Powered
Voltage	18
Amperage Capacity	15 Amps
Maximum power	18 Watts
Item Package Quantity	1
Air Flow Capacity	5 LPM
Maximum Pressure	150 Pound per Square Inch
Sound level	86 dB
Hose Length	711 Millimetres
Special Features	Automatic Shut-Off, Digital, Quick Deflation
Included Components	1 x 711 mm compressed air hose with car valve adapter, 756 hose, presta valve adapter, adapter for air mattresses, ball needle
Batteries included?	No
Batteries Required?	Yes
Item Weight	1.8 kg

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