ISDT BattAir Module is a simple plug and play device that makes any Lithium battery a "smart" battery. This works with a phone app that allows total control over the module settings. You can use these on any balance charger but to get the full function the new Air8 is required. We carry those and will be adding a charger case with them in the very near future.
They come in three different configurations.
Size: 2S: 36x16x9mm 2.8 grams
3-4S: 36x19x9mm 3.8 grams
5-6S: 36x24x9mm 4.7 grams