My cousin uses a power drill battery as a portable phone charger : r/mildlyinteresting
Milwaukee M12-18FC 18V Fast Battery Charger - Ben Burgess
Fast charging 18V battery charger
18V Universal Battery Charger for Li-ion and Ni-Cd Battery Packs (83688) | Draper Tools
Amtech - 18V Drill Battery Charger for Cordless Drills and Power Tools - Lightweight and Portable, Home DIY, Quick Charge for 1 Hour of DIY with LED Indicator Light, Lithium Ion Battery :
18V TRUMPF Cordless Battery & Charger Set
Shop Bosch 1600A00B8H 14.4-18V Battery Charger - Tools & Machining, Cordless Power Tools, Cordless Tool Accessories, Lithium Ion (Li-Ion) Chargers | Zoro UK
Black and Decker BDC2A 18v or 54v Cordless Li-ion Fast Battery Charger | Battery Chargers