Help, data acquisition sampling rate

[Armada]

Hi,

I bought a data acquistion system for my experiment to record battery
voltage readings. The problem so far is that the charging output
voltage curves I have are distorted. Can any one tell me how the
battery charging curve should be looked like in real world? Is it be
very smooth curve keep increasing all the time to MAX voltage or it
varies when you look at it in a small scale? And how to set the
sampling rate if I doing voltage and temperature recording? 100Hz? or
can be much less?


Thanks!