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This isn't LG branded itself, but here seems like a good option:
Amazon.com: [2 Battery + Charger] Caseology LG G3 2 X 3000 mAh [Long-Lasting] Spare Replacement Li-ion Battery Combo with Portable USB Port Travel Wall Charger (Non-NFC) + [18-Month Warranty]: Cell Phones & Accessories
I have that in my cart but isn't available until August 29th.
Sorry.I've bought replacement batteries for my Androids in the past, but only because the original one "wore out" due to my less than ideal charging habits. To use to keep my phone going (like on the golf course using my GPS), I prefer something fomr this page:
http://www.ianker.com/External-Batteries/category-c1-s1#Astro_Mini
I use their 8400MaH version , and could not be happier.
Just noticing that in the description of the 3 devices on that page I've looked at that none of them will charge the LG G2 and they don't specify the G3. Not sure why.