The failings are the following.
It takes two 18350 batteries and if you use IMR there is no cutoff so it's easy to over discharge the battery. The Spring is too tight to take Two Protected non IMR Battteries although it will fit a Protected and a IMR together. [Not advisable]
Also the combined 18350s don't give you the same Mah as an 18650
I found a way to get around it.
PM me if you are interested.
I highly recommend the xtar WP2 it revived 1 battery that went to 1.75V and has consistently saved the batteries that were down to 2.5 [Lowest Discharge Rate for AW IMR]
It takes two 18350 batteries and if you use IMR there is no cutoff so it's easy to over discharge the battery. The Spring is too tight to take Two Protected non IMR Battteries although it will fit a Protected and a IMR together. [Not advisable]
Also the combined 18350s don't give you the same Mah as an 18650
I found a way to get around it.
PM me if you are interested.
I highly recommend the xtar WP2 it revived 1 battery that went to 1.75V and has consistently saved the batteries that were down to 2.5 [Lowest Discharge Rate for AW IMR]
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