Test & Charge charging?

[Datman]

I'm thinking...
Can a Li-ion be charged with a switching Test & Charge technique?

It could be something like this:

(Tt=Ttest=1s; Vt=Vtest=4.20V; Ic= Icharge; Tc=Tcharge=20s; Vc= Vcharge); Imax=500mA

Tt: Vt=4.20V; an Ic=500mA is read: => Tc: Ic=500mA (max) (Vc=4.20V)
Red LED

Tt: Vt=4.20V; an Ic=300mA is read: => Tc: Ic=400mA is forced (Vc goes to about 4.26V to allow that Ic)
Red LED + 1 yellow

Tt: Vt=4.20V; an Ic=200mA is read: => Tc: Ic=300mA is forced (Vc goes to about 4.25V to allow that Ic)
Red LED + 2 yellow

Tt: Vt=4.20V; an Ic=100mA is read: => Tc: Ic=200mA is forced (Vc goes to about 4.23V to allow that Ic)
Red LED + 3 yellow

Tt: Vt=4.20V; an Ic= 50mA is read: => Tc: Ic=100mA is forced (Vc goes to about 4.21V to allow that Ic)
Red LED + 4 yellow

Tt: Vt=4.20V; an Ic= 40mA is read: => Tc: end of charge. Ic=0mA.
Green LED.

Does anyone know if it could be OK and/or it has been already built by someone?

 

[HKJ]

Some LiIon datasheets does warn against using above 4.20 volt (+tolerance), even when pulse charging, it would also trip the protection on some batteries.