I have a number of LED head torches/torches that use 18650 3.7v lithium batteries. The Torches are great even though they are cheap chinese items. The batteries less so and the charge seems to be disappearing quite quickly. They dont seem to make their mind up what their capacity is as one part of the battery says 3500mah and another label says 1100mah... Who makes good branded versions of these batteries that should be reliable?