Bat Light Charging Voltage?

[TØny Hine]

I have an Eiger Bat light.

The mains charger is 6v 500 mil amps

The car charger is 12v unlimited amps?

Why?

I'm guessing that the voltage of the mains charger is dependent on the bat light battery resistance, hence a low starting voltage. In other words the battery has a variable resistance that could cause over heating and a possible fire if the mains charger was 12v as it may have a higher voltage at different levels in the charging cycle.

However the 12v (13.8v) car battery never goes over voltage in other words is naturally regulated.

Or the assumption is the car supply will only be on intermittently, for a short time. And/or that the light is never left unattended by nature of the fact that you will be in the car.

Whatever the reason, I don't understand the difference in the charger ratings and can't really think of a logical reason other than the ones I have guest at...

Your insights observations would be most appreciated...

[Norman - M0JEC]

Are they pluged in via the same socket? If not then the car (12v) one will
have some form of voltage dropper/regulator?

If so it maybe that the higher 12v level is enough to 'switch' (relay? -
might be a 'solid state' relay) in a charging circuit, where the 6v Mains
charger has this 'regulator' built in?

I'm guessing of course.

You could build an adaptor so you can break the connection externally and
monitor voltage/current to see more closely what is actually happening?

Norman
M0JEC

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[TØny Hine]

Hi Norman, 

But why not just have a 12 volt mains charger? Then there's no need for switching or voltage dropping?  Is definitely a puzzle, and I usually find that if you solve a puzzle you can usually learn something!

[Norman - M0JEC]

Might be that it has a 6v (or lower?) battery, so less losses charging with a 6v mains charger, and as it's from the car no need to care about a bit of extra loss when charging in the car?

 

Again just guessing here.

 

Norman

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From: TØny Hine

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