Depending on your alternator's output voltage, I don't think you need to worry about top balancing at all. Even at 14.5V, you have 3.625V per cell. That isn't even fully charged. This is a good thing because you don't have to worry about overcharging the cells, and it prolongs their life. The downside is you have reduced capacity because they aren't fully charged. This likely isn't an issue unless you're using tiny cells.
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