I did... all I get is a green light (Ultrafire WF-139) it doesn't start charging at all.:thinking:
Hi Light. Some chargers are incapable of resetting the protection circuit. What you might try, and
there is a bit of risk here, is parallel the Solarforce cell with another "good" cell for one second, or less.
If you attempt to do this, do so in a safe environment and only parallel the cells
for one second, no longer. Usually, this will reset the protection circuit, if that is the problem. Check the voltage of the cell afterwards, if it is ~3.00 Volts or so, the cell should then charge normally on your WF-139. If there is no voltage after paralleling the cell with a good cell, the Solarforce cell is likely damaged, or defective. If the voltage comes up, but not to around 3 Volts or more, I would abandon the effort, as the cell has been over discharged.
A good way to parallel the cell with a good one, is to hold both cells on the edge of a metal kitchen sink, positive (nipple) side down, and bridge a table fork across the bottom (negative) ends. Again, do not parallel the cells for more than one second
maximum, or you may run into trouble.
Also, cells that are reset in this way should be monitored closely when charging, for several cycles. If you notice the cell is warmer than normal when charging (if it gets "hot" stop charging!), does not hold a charge well, or any other anomalies, discard/recycle the cell, as this is a sign that the cell has been damaged.
And last but not least,
try this at your own risk! The chances of something bad happening are minimal, but......
Dave