It's not terrible... The iPhone 17 has a battery capacity of 63 nano lb·AU. Around 16 million would equal 1 lb·AU.

Another fun one would be milli hundredweight leauge (mcwt·lg). Both hundredweight and league have multiple accepted definitions to make it more "fun". But the range maps quite nicely to everyday things:

AA battery - Around 5 mcwt·lg

Phone battery - Around 20 mcwt·lg

Laptop battery - Around 200 mcwt·lg

Car 12v battery - Around 1,000 mcwt·lg

EV battery - Around 100,000 mcwt·lg