Hi,
I have been looking for a quality mains USB charger/hub, and wishing to avoid the terrible chinese tat chargers found on Ebay - often designed and constructed not to UK Electrical Safety Standards (even though some say they are).
I took guidance from BigClive.com - who did a teardown on this Ikea SMAHAGEL charger - which he highly rated for quality:
The short version:
... and the full version:
However I have plugged in my rechargable headphones (these are cheap chinese ones) but afte a few charges the battery appears to expire within 10 minutes or so when used.
I once tried some cheap rechargable bicycle lights in a samsung mobile phone charger - and the lights stopped working straight after.
I had up until using these mains power USB chargers, charged the headphones and bike lights off my laptop.
I read in the below thread regarding over-supply to the device by the charger - is that happening here ? and does this charger rely on some circuitry on the device itself to limit current. Could one assume poorly designed chinese devices - lack such circuitry ??
Over charging devices
www.diynot.com
I'll watch the long version again over lunch, would i be correct to assume - the charger will feed what it thinks it can push into the device - even at the cost of it damaging the battery, and it is the devices task to limit that ?? So whilst the Ikea charger is well made and trustworthy, it cannot know what pull of charge is likely to be drawn from it - if the devide is 'dumb' in that respect.
In the worse case the device could catch fire whilst charging - yet the instructions for using the Ikea charger give absolutely no warning of this.
Do I understand this mostly correct, thoughts appreciated.
I have been looking for a quality mains USB charger/hub, and wishing to avoid the terrible chinese tat chargers found on Ebay - often designed and constructed not to UK Electrical Safety Standards (even though some say they are).
I took guidance from BigClive.com - who did a teardown on this Ikea SMAHAGEL charger - which he highly rated for quality:
The short version:
However I have plugged in my rechargable headphones (these are cheap chinese ones) but afte a few charges the battery appears to expire within 10 minutes or so when used.
I once tried some cheap rechargable bicycle lights in a samsung mobile phone charger - and the lights stopped working straight after.
I had up until using these mains power USB chargers, charged the headphones and bike lights off my laptop.
I read in the below thread regarding over-supply to the device by the charger - is that happening here ? and does this charger rely on some circuitry on the device itself to limit current. Could one assume poorly designed chinese devices - lack such circuitry ??
Over charging devices
USB chargers.
The USB charger my wife uses says 12W 2.4A and 5.2V but I thought USB stood for Universal Serial Bus? so there will be a standard current 500 mA USB 1.0 and 2.0 and 900 mA for USB 3.0. So at 900 mA my sockets rated 2.1A for pair should be ample for any USB charging, it should not need 2.4A...
www.diynot.com
I'll watch the long version again over lunch, would i be correct to assume - the charger will feed what it thinks it can push into the device - even at the cost of it damaging the battery, and it is the devices task to limit that ?? So whilst the Ikea charger is well made and trustworthy, it cannot know what pull of charge is likely to be drawn from it - if the devide is 'dumb' in that respect.
In the worse case the device could catch fire whilst charging - yet the instructions for using the Ikea charger give absolutely no warning of this.
Do I understand this mostly correct, thoughts appreciated.
