Make cheap 6V battery charger circuit from a mobile charger lead acid, ni-mh, ni-cd - YouTube
Schumacher Electric Schumacher Pro Automotive 6-Volt/12-Volt 8-Amp/2-Amp Battery Charger and Maintainer with Auto Voltage Detection SPR1628 - The Home Depot
MOTOPOWER MP00207 6V and 12V 4AMP Automatic Smart Battery Charger, Bat — MOTOPOWER DIRECT
Amazon.com: 6V Charger for 6V Kids Ride On Car,7V0.8A for 6 Volt Battery Charger for Kid Trax Disney Princesse Toddler Quad Disney's Frozen Minnie Kid trax Moto ATV Audi R8 Spyder BMW
Amazon.com: 6V Charger for Kids Ride On Car 6 Volt Battery Charger for Frozen Scooter Batman Car Minnie Mouse 3-Wheel Scooter Ripper Swirl YFZ450 B-Type Plug : Toys & Games
Tornado1200 - TOPDON USA
Battery Tender JR (6 Volt) – Tri-State Battery Supply