On 21/06/2011 13:41, Theo Markettos wrote:
ARWadsworth wrote:
John Rumm wrote:
One option:

Remove batter and look at the marked voltage.
Set bench PSU to same
Connect PSU to battery terminals on phone...

Bench PSU? Whats wrong with two flyleads from the phone charger?

The phone charger input is likely at a different voltage to the natural cell
voltage of the battery (eg 5V from USB v 3.6V from lithium ion). The
battery charge circuit might not like that.

As it is, you might still have difficulty: the battery smarts won't be
there. Depends whether the phone will power up if it has a voltage but
can't read status from the battery.

Theo

Phone batteries are not *usually* that smart - they usually have a
simple analogue circuit which will disconnect the battery to prevent
overcharge or overcurrent. The third terminal is usually a thermistor
connected to the negative terminal which the charging circuit in the
phone uses to monitor battery temperature.

I have successfully charged phone batteries from a bench PSU.