I just ran a LiPo (Trakpower 4900) in my BJ4 (non-WE) tonight for the first time - yes, it's designed for a stick pack, but not for batteries shaped like a brick. I just put some double sided mounting tape in between the strap and battery, then taped them together. When charging, I just lifted strap, battery and all out - the balancing port was accessible through a hole in the Associated aluminium strap I was using.
And yes, I did crash - plenty of times. Didn't budge.
This should work just as well for saddles - it might mean you need several battery straps if you have multiple batteries though...
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