Originally Posted by
Hit Factor
Looks like Garmin makes an external battery pack for the 820: Garmin Charge™ Power Pack PART NUMBER 010-12562-00
Thats quite convenient but $$$
I'm using a Magicshine RN900 as my backup headlight and battery bank. It keeps my garmin charged.
https://www.aliexpress.com/item/4001041143551.html