these kind of look promising dont they for the 7.4V option instead of the 16340?
Ultrafire 18350 1200mah 3.7v BUTTON TOP Rechargeable Lithium Battery Li-Ion UF18350
they should fit since they are only a little longer than the 18650
you might not even need a spacer
draw back is no PCB on this model
but they are 1200Mah
so you can expect at least a real 1000Mah off them
(thats just guessing since the gray ultras/trust 880Mah are really 600MaH)
Ultrafire 18350 1200mah 3.7v BUTTON TOP Rechargeable Lithium Battery Li-Ion UF18350
they should fit since they are only a little longer than the 18650
you might not even need a spacer
draw back is no PCB on this model
so you can expect at least a real 1000Mah off them
(thats just guessing since the gray ultras/trust 880Mah are really 600MaH)
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