MobileRead Forums - View Single Post - PRS-T1 PRS-T1 Battery problem

tnoko · 02-22-2012, 09:13 AM

I could not figure out the charging issues with this device. Sometimes it sit for for days in the charger, with no positive effect.

So I made my own charger out 5Volts 5Amps power source. It had an amp-meter too. This is what I found out:

PRST1 starts charging cycle with load tests (max 750mA). If the charger is able to provide, it happily continues using the biggest. If all of those tests fails, the charging current will be extremely tiny (50mA), which would take WEEKS to charge the battery.

The problem is that the Sony's test is TOO DAMN SHORT, it does not allow the the voltage to settle.

I found plenty of USB-cords that could not provide. And in fact often the RF-filter (the black round thingy) seemed to raise the inductance just enough for the load test to fail. Sony's own USB cord is OK. Also all cords which are very short and do not have the RF-thingy are good.

02-22-2012, 09:13 AM	#39
tnoko Immobile Posts: 1 Karma: 10 Join Date: Feb 2012 Device: Sony PRST1	Sony PRST1 charging problems (solved) I could not figure out the charging issues with this device. Sometimes it sit for for days in the charger, with no positive effect. So I made my own charger out 5Volts 5Amps power source. It had an amp-meter too. This is what I found out: PRST1 starts charging cycle with load tests (max 750mA). If the charger is able to provide, it happily continues using the biggest. If all of those tests fails, the charging current will be extremely tiny (50mA), which would take WEEKS to charge the battery. The problem is that the Sony's test is TOO DAMN SHORT, it does not allow the the voltage to settle. I found plenty of USB-cords that could not provide. And in fact often the RF-filter (the black round thingy) seemed to raise the inductance just enough for the load test to fail. Sony's own USB cord is OK. Also all cords which are very short and do not have the RF-thingy are good.