I've owned these for 8 months and they save so much money. They are the best capacity 9 Volt Rechargeable Lithium-ion Batteries I've tested. These have about double the capacity of normal alkaline 9v batteries (like Energizer & Duracell) and several times the capacity if you use them on higher drain items. These batteries will certainly over the long run be better value than the non rechargeable types and could save you 10x-20x the price paid.