What is the best way to recharge Anker lithium ion products?

I currently have 2 battery packs the 26800mah and the 16500mah. I usually recharge them when they hit about half power, I have heard that running them to empty can be stressful on these batteries.

You can recharge them at any time (half full, 3/4 full, etc) as there is no “memory effect” with lithium ion batteries. You are correct that complete discharges can negatively affect the battery, but every once-in-awhile is OK.
So, basically, charge it whenever you get a chance and the batteries should last you a long time.

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We always recharge the battery when is either dead or when one light is left. It take some time for full recharge so better leave it overnight.