Sorry, Noah. Close, but no cigar
International rules from the post on page #2 of this thread:
"
With the approval of the operator, portable electronic devices may contain lithium ion batteries exceeding 100 Wh, but not exceeding 160 Wh and no more than two individually protected lithium ion batteries each exceeding 100 Wh, but not exceeding 160 Wh, may be carried per person as spare batteries in carry-on baggage".
Translation: Airline "might" allow max 160 WH each, max 320 WH total of 2 batteries.
This is a minor variation from domestic US FAA rules, where they allow same 2*160WH but without the airline approval.