I’ve been carrying a random EBay Chinese jump starter pack with me for over 18 months. I haven’t needed it yet but have jumped a half dozen bikes on the way of other people and it works great. Only good for one good boost and then needs recharged. Yes it also has a USB outlet but it’s a lightweight lipo designed for a short strong burst and not prolonged small charging drain. I’m also carrying a 20,000 mah power bank for device charging on the go.