Wish to buy Battery, Charger and Buck converter for 12V , 2A router

Hi,
I need to do some Teams interviews and will be in my car in a car park at the time as I will be "on the road".
My Samsung SM-J330FN smartphone will not run Microsoft Teams.

As such I have to use my laptop with my B625-261 mobile router. The router needs a 12V, 2A power supply. As such, I will need to buy...
1...A 24V rechargeable battery pref >2Ah
2...Charger for the above battery (can be uk mains powered)
2....A Buck converter for 18-30V to 12V dc , 2A (to power the router)

Unfortunately I am not allowed to make my own Buck and Charger in the lab where I currently work, as such , I must buy all offtheshelf.
Do you agree the following is the cheapest option...It'll cost £59 total...seems a lot?


24V lithium ion battery and charger £48
Batt and charger

Buck Converter: 18-35v in 12v out at 10A £11
Buck 24V to 12V

B625-261 Router
Router

Why do you need a mobile router?

Your phone apparently has a hotspot/internet sharing feature, so turn it on, connect your computer to your phone's hotspot and you have internet via your cell connection.

Thanks very much, that sounds a great idea.
Of course, i dont have this smartphone on a contract, i just top up its SIM with £10 PAYG whenever i need it. But thats ok....its still worth doing. -And avoids buying all that charger/batt/Buck !!

(i had initially intended to use the router's SIM inside the smartphone to go on Teams (then i wouldnt have needed to pay £10 topup) ...but of course the smartphone doesnt do Teams so thats a moot point anyway)