MODULAR BATTERY INSERT PAK FOR CELLVAULT-5M Additional modular inserts to run almost any combination of batteries in the CellVault-5M Modular Battery Storage Case. Thyrm makes inserts for AA, AAA, CR123/16650, 18350, 18650, and 1632 batteries. When you combine extra Modular Insert Pak inserts with those that come with the CellVault-5M Modular Battery Storage Case, the possibilities are almost endless. Need to run ten CR123s? You can do that. How about four 18650s and two CR123s? Yup. You can also keep batteries staged outside the CellVault-5M and quickly swap them into the case to match your mission. The CellVault-5M Modular Battery Storage Cas Mfg: Thyrm Llc