optimum charging current

[Madadoor]

Hi all

I have an xtar VP2 to charge my 4 samsung 25Rs and 2 VTC4S, I usaly have them charging at 0.5a current. My VP2 allows charging at 0.25a, 0.5a and 1.0a. Just wondering if anyone could chime in with the best charging current to be charging these particular batteries on?

Thankyou in advance

 

[Thrasher]

People have a ton of theories, . 5 is best 1 wears out the cell faster etc.
In the end your going to get well over 300 charges with these hybrid batteries no matter how you charge them and contrary to what people think several of the newer batteries suggest no lower then .8

I have the same charger, I run on 1 cause I don't feel like waiting 7 hours.
Specs:

Samsung
Flat Top
Nominal capacity: 2500 mah
Max Continuous Rated Discharge: 25 amps (at 25 degrees C)
Nominal voltage: 3.6v
After a fresh charge: 4.2v
Cycle info: Capacity drops to 60% after 250 full charge/discharge Cycles
Don't discharge below: 2.5v
Standard Charge: CC/CV @ 1 amp / 4.20 volts +/- .05v, 100 mA cut-off
(Max) Rapid Charge: CC/CV @ 4amps / 4.20 volts +/- .05v, 100 mA cut-off
Impedance: 22.15 +/- 2 milliohms
Weight: 45g


Sony 4
Specs:


Flat top
Nominal Capcity: 2100 mAh
Rated Capaciity: 2000 mAh
Nominal voltage: 3.7v
Voltage after a fresh charge: 4.2 +/- .05v
Do not discharge this battery below: 2.5v
Maximum charge voltage: 4.25
Continuous Maximum Charge Current: 10 amps
Continuous Maximum Discharge Current: 30 amps
Weight: 45.1g
Allowable Enviroment Temperature for Charging: 0 to +45 degrees C
Allowable Environment Temperature for Discharging: -20 to + 60 degrees C
Recommended Charging Algorithm: CC-CV 4.20V +/- 0.005V, 1.5A, 2.5 hours