I've been experimenting with using USB power adaptors other than the one supplied with the Android tablet and I'm struggling to understand why adaptors of a similar spec to the original are charging at much lower rates.
Could anyone help shed some light on what's going on?
Tablet: Acer Iconia B1-750
Measurement App: Ampere charging meter app from Braintree https://goo.gl/SQNiQb
Adapter | |
Manufacturer | Output Spec | Charging Rate
Liteon 5.2V 1.35A 250mA (original adaptor)
Delta Electronics 5.35V 2A 30mA
NewLink 5.0V 2.1A 20mA
NewLink 5.0V 1A 20mA
- All measurements were taken using the same USB lead
- The adaptors were all plugged (successively) into the same wall socket.
- The rate readings were taken after a minute or so of plugging in to allow the charging rate to settle.
- All the readings were taken within a few minutes, with the tablet battery level at about 50%
- Each adaptor was unplugged and replugged a few times to check for consistency of readings.
- All adaptors are single port
So, can anyone help me understand why the first three, similarly spec'd chargers aren't charging at the same rate?