What is considered safe when dumping capacitor into a battery?

[ephemeralt8]

I have a 100AH 12V (LiFePO4) battery and I'm wondering what is considered safe voltage when dumping a capacitor into a battery? 

The battery has the following ratings

Standard Charging Voltage 14.6 (+-) 0.2V
Standard Continuous Charging 20A
Max Continuous Charging 100A

Now this ratings are for DC, but when dumping using pulsed DC capacitor, the effect is different right? 

What would be the max voltage that's safe to dump into a 12v battery from a capacitor? 
How much does amp matter when dumping from capacitor to battery? 
Does the frequency of the dump matter?

Thanks!