CELLVAULT-21 BATTERY STORAGE FOR 21700 AND STREAMLIGHT SL-B50 Protect your spare 21700 battery while keeping it immediately accessible with the CellVault-21 Rechargeable Battery Storage. Premium batteries require protection from physical and environmental damage but need to remain accessible to keep advanced tactical lights running at full power. The CellVault-21 Rechargeable Battery Storage provides the same feature set as our popular CellVault-18 including dual-wall construction & side viewing windows but adds a larger capacity and an upgraded latch that allows for easy installation, especially on tight MOLLE/PALS webbing. FEATURES: Mfg: Thyrm Llc