[embee]

Be cautious. For example, don't have things like USB ports connected directly to the battery, they often have quite substantial quiescent current draw even when nothing is plugged in
A friend had his battery go flat on the bike for no apparent reason, until we discovered that he'd left the USB adapter plugged in. I measured the draw at around 25mA, which was enough to effectively flatten the battery in a week or so.
Whatever arrangement you end up with, check there is no significant quiescent current draw when everything is switched off, anything over single figures mA can cause issues, ideally you want less than 5mA tops.