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MetalMan
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09.02.2009, 02:22 PM

The 109 uses a total of three stages to charge the battery.

1. Charges at half the rate selected (so if you set it at 5.0amps it will actually be charging at 2.5amps). This goes on for two minutes, at which point it determines the cell count by the voltage it reads from the battery. This is a crucial point because it is the only point where the cell count could wrongly be selected. However, anything less than 7s should not pose an issue to cell count selection unless it was discharged excessively prior to charging.

2. CC phase, charges at the selected rate. Cell count is locked in.

3. This is where it gets weird - instead of a CV phase, the 109 pulses the selected current to keep the voltage as close to 4.20v/cell as possible. The pulses become shorter and shorter as the pack nears 100% charge.


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