Keep your cell phone or tablet at the ready with this Tzumi PocketJuice 3683BB-2 portable charger, which features 5200 mAh of power to charge your device up to 3 times before needing a recharge. An LED indicator lets you know the charging status.
I bought this to recharge my Galaxy S7. The small size allows me to keep both the phone and attached charger in my front pocket at the same time.
The charger is good for a few refreshes of the phone before I need to recharge the charger. And it's quick enough that I usually don't need to keep the phone attached for long.