Bat Safe XL LiPo Charging Case (Silver) [BAF BAT SAFEXL SLV] HobbyTown LiPo Battery Storage: Proper Voltage and Long Term Storage Amazon.com: Crazepony 4 Ports LiPo Battery Storage Charger and Discharger, 1S 3S RC Balance Charger Tiny Whoop Charger with Storage Mode : Toys & Games Most Lipo battery chargers have a Storage mode. If you dont plan on using them in the next few days it is always best to bring your batteries down or up to storage voltage (approx 3.8v per cell). Koswork XS Lipo Charging Case Storage Case (180 x 80 x H100 mm) KOS32310XS Nobody's kidding about proper LiPo storage Flite Test