AUX Power to the top box

Use an external battery to charge it plugged into a switched USB
Simplest way.
Gives you enough for 4-5 charges before it is empty but is always topped up when riding.
The two larger Decathlon ones are brilliant value
 
You could install a quick disconnect to the box something like
https://www.amazon.com/Luggage-Electrix-PTB-001-Tankbag-Saddlebag/dp/B00LB4ACQ6
http://www.ebay.co.uk/itm/Powerlet-...=523386922&hash=item1ecf69d181:i:132328837505
cefe8b27b71166fafef75b1a7b2fed12.png
 
What about using a block charger for the headset. I use one to boost the battery on the Interphone F5 when on longer days out etc. :nenau

I could but it's more stuff to carry and I would have to remember to charge it as well.
The USB doesn't cause me a problem.
 


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