Should be absolutely fine even for long-term storage. I use a CTEK MXS 5.0 and found it way better than a Battery Tender, especially for extended long-term (years are no problem). Steps 7 and 8 are magic with it's Pulse and Float Maintenance modes.
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-Mike M.
2013 M3
[E92, Alpine White, ZCP, DCT]
2016 i3 REx
[Tera World, Capparis White]
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