Background and Method
More fully explained in this post but briefly I am using a control battery to confirm if any degradation is due to float charging or simply the passage of time and high ambient temperatures. Apart from the time being tested the test battery remains in a CC/CV charger floating at 3.93V. This charges the cell to approximately 70% of capacity then floats at this voltage. The control cell is charged to about 50% capacity before being removed from the charger and stored on the shelf. When the control battery is tested it is fully charged before the test.
Initial Test Results after 8 Months
Having established a base line for the cell capacity when fully charged I have now floated one cell at 3.93V for 8 months with 12 discharge tests during that period.
Looking at the discharge tests of the battery left on float charge at 3.93V there is as yet no meaningful degradation in capacity. The Feb 23rd test followed a scorching record breaking few weeks of summer and can be discounted.
A full charge of the test battery versus the control battery shows no ill-effects after 8 months. I'm just about done with claims you can't float charge a Li-Ion cell. As yet there is no evidence that a conservative float charge does any damage to a Li-Ion cell.
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