I need to purchase 30-50 18650 Li-ion batteries. There is such an enormous range of specifications for this cell that it is mind boggling. I see specs from 1000 mAh up to 6000 mAh. I find that difficult to believe. I am looking for longevity and quality more than capacity. These will be used in a transmitter sending telemetry data. The transmitter will be active for 4 minutes at a time drawing 1.0 amps. Has any Expert seen a brand comparison done that is not manufacturer sponsored rating several different brands? It would be great to see some impartial ratings. I do not want a cell that is very low for obvious reasons nor do I want to push the limit of capacity and sacrifice longevity. Any suggestions would be welcomed. I prefer to buy this type of item either from Amazon or DigiKey.