(ET) More on gel cell charging

[tbamc <tbamc gbta net>]

I've a couple more questions about this:

1.  A  < 14.3v limit on charging gel cells was mentioned.  I gather this 
applies to ALL 3 phases?

The practical reason I ask, is the attempt to charge some 6v 4Ah gels 
with a wall wart.   One I have has a rated 9v 200mA output.  Charging 
voltage on a fairly dead battery starts out at 6.7 or so and gradually 
rises.  Could I simply keep an eye on this and stop once it reaches 7.1v 
or so?  At that point I would still not have a fully charged battery, 
but if I understand correctly, I would not want the voltage  to go 
higher.  Could I then place a resistor in series, to get the appropriate 
voltage, and continue?

Or, would it work to make a voltage divider--say, 10 and 35 ohms, which 
would do the whole charge, never exceeding 7.2v?

And last, would a 'smart' charger for 6 and 12 v batteries be 'too much' 
for these little 4Ah guys, or is it likely smart enough treat them gently?

Thanks.

Thon

(David, thanks for the tutorial on gels several weeks ago.  It did help.)