phone overcharging

[brettchallenger]

I use my phone as a Sat Nav.  However, when I plug it into the 12v outlet on my 18 V-strom 650, after a while I get a message on it saying that it is overcharging and should be unplugged.  This never occurs on my other bike.  Do I need some kind of modifier between the plug and the phone?

[Keith60]

Phones should automatically shut the charging down when it reaches 100%.  It shouldn’t be affected by the charger!!  So I can’t see why the bike USB charger should over charge!!  Sounds to me like the phone not the bike.     

[Rusty Nuts]

I've had overheating messages when the phone was under clear vinyl in a tank bag, but not over charging. And that was with no apps running.

[Holmsey]

Used to happen on mine when it was in the case.... Its all to do with the phone overheating.
Depending on what phone you have you can go into the battery settings and have a look to see if there is an issue.

[brettchallenger]

yep, been in battery settings, no problems.  It doesn't come up with any messages when plugged into a charger coming off the mains.  Pretty sure the phone isn't overheating as it is out in the wind when its on the bike.  The phone is getting on a bit though, about 3years old but loathed to get rid of it as it works so well - and it was cheap!

[Brockett]

Have you checked the step down power supply is kicking out the correct voltage?  These things can deteriorate in time.

[sjrainsford]

Yep I’d go with the actual charger you’re using. The voltage regulation on the cheap ones is really poor.

[user650]

Is your phone set to fast charge? it may cause issues. Turn it off and try 

[brettchallenger]

No.  As I said, this only occurs on the V-strom, my other bike is fine and charging via the mains in the house does not cause problems.

[Joe Rocket]

I don't think I'd risk blowing the phone just because 'on the other bike it's fine........'

Does it 'plug in' just the same? Different connection to the bikes' circuits? There is something different there.

[sjrainsford]

As above.

In the house your phone charges using a USB plead plugged into a phone charger.

On the bike it must do basically the same. You have a charger which converts the motorbikes 12V supply to a USB friendly supply. You then plug your phone into that typically again using a USB cable.

When you plug into your other bike are you using the same USB converter/ adapter? Or a different one? This is the important question we need answering so a decision can be made as to where the issue lies.

[Holmsey]

As above..... It's all to to do with 1amp, 1.5amp, 2amp charging.

[brettchallenger]

The other bike goes through a converter with a maximum output of 5v and 3amp.  My home charger which runs off the mains output is 5v and 1000 mA.   The manual says the output at the aux output terminal can handle a maximum of 36w which is 3amp.  However, the usb adapter I use for the aux socket has a maximum output of 5V and 1.2A

I will have to take another camera with me, so I can take a pic of the phone screen the next time the screen warning comes up.  It never does it at idle so it's not something I can recreate in the garage.

[Mr Nick]

Do you have the means to check the output voltage from the USB port? I suspect it's a voltage issue rather than current. The 2 outer pins should show 5V across them.

[sjrainsford]

You need to try a different converter on your bike that is causing the issue.  Cheap ones are prone to these sorts of issues as the regulation is very poor on them.

[brettchallenger]

Do you have the means to check the output voltage from the USB port? I suspect it's a voltage issue rather than current. The 2 outer pins should show 5V across them.

At idle, it shows 5.1V.  I will have to wait for an extra pair of hands to check if that increases as the revs increase.