I have an S1. Bose replaced it because of the battery drain issue, and the replacement is pretty much the same. The key to using it on battery power is to charge it before you use it... it will run for hours on a full charge. But, if you let it sit for weeks (turned off) you may find the battery is discharged. Only an issue of you let it sit and have an impromptu need for it on battery.
As far as the S1 or a "copy"... I'll stay with the original.
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