UPDATE: Battery Placement (Sept 4, 2018)The configuration above worked well enough but several small annoyances pushed me to attempt another storage solution.

Lugging the entire unit along with whatever else is in panniers in and out of the office.

Disconnect and reconnect at least two times a day. If I decided to ride to lunch, I have bring panniers back down, reconnect etc.

Occasionally the on/off switch would get bumped to the off position during a ride.

Loss of space in panniers.

I'd seen battery packs and rear racks custom designed to hold a battery and thought "Hmmm. Maybe I can MacGyver something together". If you're a "visual learner"click through the gallery below. A few extra details follow the gallery.

Battery project info: I only resorted to disconnecting the components because I couldn't find a low profile box to fit the OEM assembled size. The box used is an Mmf Steelmaster Cash Box With Lock (Link) 2.9" Height x 10.3" Width x 4.4" Depth. On/Off switch was originally mounted to a shaped piece of aluminum and double-stick-taped to the battery.

I'll begin commuting with new set up soon. And yes, I am now leaving the entire kit outside with my bike but A) Work commuting is 95% of my bike use, B) bike parking is literally at the front door and protected from the elements and C) I'd rate building security as level A - so all in all I'm comfortable. While out and about elsewhere, I assume most people won't have any idea what that box is with wires going into it and for those that do it would be a pretty messy/destructive smash and grab.

Detail 1

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Detail 2

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