I trickle charged through my Powerlet plug all the time with no problems when I still had the Yuasa battery. Now that I have a Shorai LiFePo battery it has it's own direct multi-pin connector for its charger - the connection tucks away under the fuse cover.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge