Lately I have been using my Beeline motorcycle sat nav which I won in a competition (I'll tell you about that another time) and I have been worrying that it will flatten my phone batteries - consequently I've decided to fit the same USB charger as I have on the W/NG to the Huntmaster.
I buy these from eBay for about £15 - they are very nicely made.
The eBay description says:
- Square Dual USB Super Fast Charge + Voltmeter
- Input voltage: DC12V
- Monitorable voltage range: 6-30V
- Product material: ABS high and low temperature resistant flame retardant environmental protection material
- Qualcomm 3.0 quick charging standard
- Output voltage: 5V3.4A/9V2.5A /12V2A
I found that they seem to work perfectly well coupled to a six volt battery because of course I'm only looking for a five volt output from the USB ports. The voltmeter is quite useful if you can actually see it - but you use it for diagnostics not when you are riding your bike!
You have the option to fit these things with a bracket or a handlebar clip and they come with a length of cable and a fuse holder.I wanted to fit the charger inside my left knee above the battery and in front of the toolbox and I made a stainless steel bracket to bolt underneath the dynamo regulator.
As you can see in the picture it's too low and you can't get the battery back in. I might modify this bracket or make a new one to give it higher and further in board to allow it to stay in this position:









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