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Start by ditching the idea of charging to 4.0 volts. It works fine with a single cell but they will exhibit a little scatter in a series string. The higher the charge voltage and the longer the string the worse it will be. Lithium does not need to be fully charged regularly, unlike lead acid batteries that loose capacity if not fully charged on a regular basis. In fact, high ending voltage is one of the stresses that can limit the life of Lithium batteries. The capacity left unused at the top by stopping a charge at 3.5 volts and 1% of C is perhaps 2%.

I suppose simple zener regs would work, in fact you can charge with no regulators at all if you make sure the cells are initially balanced with each other. You can also install a battery management system. If you go that route please make sure the charger will safely shut down without serious overcharging despite any failure of the BMS.
 
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