[Critter]

5 seconds on google.

https://www.google.com/search?q=where+is+the+battery+on+a+2016+cb125f&rlz=1C1RUCY_enUS692US693&oq=where+is+the+battery+on+a+2016+cb125f&aqs=chrome..69i57.21891j0j8&sourceid=chrome&ie=UTF-8

Under the seat, follow the link to several utubes on how to get to it and/or remove it.

 

[Critter]

Well I looked further down that same page and came up with a 2017. Looks to be on the left side by the tool box.

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Tried to link the photo, but no joy. Here is the link:

https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjzkLjNoMjfAhUrhuAKHUzSCxoQjRx6BAgBEAU&url=https%3A%2F%2Fwww.bike-parts-honda.com%2Fhonda-motorcycle%2F125-MOTO%2FCB%2F2017%2FGLR1251WHH%2FFrame%2FTOOLS-BATTERY-BOX%2F96144%2FF_28%2F2%2F25682&psig=AOvVaw0Wrd19eyE7l1NsnsRhU36_&ust=1546283303611880