VIFLY WhoopStor 3 1S LiPo LiHV 6 Channel DC USB C Battery Storage Charger Compatible w BT2.0 and PH2.0 White 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). Bat Safe XL LiPo Charging Case (Silver) [BAF BAT SAFEXL SLV] HobbyTown Amazon.com: Crazepony 4 Ports LiPo Battery Storage Charger and Discharger, 1S 3S RC Balance Charger Tiny Whoop Charger with Storage Mode : Toys & Games RC LiPo Battery Storage Keep Your LiPo's Safe & Healthy