I'm guessing their aren't any hard and fast standards as phones seem to behave differently but are there any standards they work to for the charger voltage?
Background
I run an Android phone as a sat nav on my motorcycle and have done this with many phones.
The PSU is usually a generic car charger that I re-package to make waterproof. My latest version though is a sealed 5v 2.5 amp PSU (from ebay), which worked fine with a previous phone but not with my latest.
I've done some testing between my 2 current phones and two chargers and have different results for each.
Charger A is labelled as output 5v 1.0 amp (mains charger) and has an open voltage of 5.1 volts.
Charger B is labelled as output 5.3v 2.0 amp (mains charger) and has an open voltage of 5.28 volts.
Phone 1 is a Nokia 7 Plus that is USB-C and has fast charging 18W
Phone 2 is a Blackview BV6900 is USB-C and has fast charging rated at 9v 2A / 18W
Charge current was monitored using an app on each phone.
Phone 1 on charger A charged at 1250 mA., and on charger B managed 1450 mA.
Phone 2 on charger A charged at 150 mA., and on charger B managed 1650 mA.
On my motorcycle's PSU Phone 2 only manages 150mA but it needs to be at least 600 mA for it to keep pace when in use.
So my plan is the make a new PSU from a DC-DC buck converter and to tune the voltage until I get an acceptable charge rate (to around 5.3 volts I think).
I don't want to kill this phone though hence I'm wondering if there are safe voltages that are higher than 5v?
Background
I run an Android phone as a sat nav on my motorcycle and have done this with many phones.
The PSU is usually a generic car charger that I re-package to make waterproof. My latest version though is a sealed 5v 2.5 amp PSU (from ebay), which worked fine with a previous phone but not with my latest.
I've done some testing between my 2 current phones and two chargers and have different results for each.
Charger A is labelled as output 5v 1.0 amp (mains charger) and has an open voltage of 5.1 volts.
Charger B is labelled as output 5.3v 2.0 amp (mains charger) and has an open voltage of 5.28 volts.
Phone 1 is a Nokia 7 Plus that is USB-C and has fast charging 18W
Phone 2 is a Blackview BV6900 is USB-C and has fast charging rated at 9v 2A / 18W
Charge current was monitored using an app on each phone.
Phone 1 on charger A charged at 1250 mA., and on charger B managed 1450 mA.
Phone 2 on charger A charged at 150 mA., and on charger B managed 1650 mA.
On my motorcycle's PSU Phone 2 only manages 150mA but it needs to be at least 600 mA for it to keep pace when in use.
So my plan is the make a new PSU from a DC-DC buck converter and to tune the voltage until I get an acceptable charge rate (to around 5.3 volts I think).
I don't want to kill this phone though hence I'm wondering if there are safe voltages that are higher than 5v?
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