Voltage and Current Source Charging Battery

Hi,

i read through some of the posts in this forum, but i wanna make sure i understand them correctly, hope any one could help :)

lets say i wanna charge a 70AH:

Considering senario ----

1. by using a voltage source (like car alternator, giving out DC ~14V), it will charge at 20A to ~0A ( 0% to 100% full).

2. by using a voltage source (like car alternator, giving out DC ~14V), + current limiter (limit at 10A), it will charge at 10A to ~0A (0% to 100% full)

3. by using current source ( any example? ) that give 20A constantly, it will charge at 20A to 20A (0% to 100% full).

are the senario above i mentioned correct?

thsnk in advance.