Why can't the replacement Dell laptop battery be charged?

Why can't the replacement Dell laptop battery be charged? How to solve this problem?

Take some replacement Dell laptop batteries for example:1691p, dell inspiron 6000 battery, dell 75uyf , dell latitude c510 battery, universal external laptop battery and so on..

1)Reason:

a.The replacement Dell laptop battery has no voltage.

b.There is problem with charger, as it has no output electric current.

c.Low charging efficiency due to external cause.2

2)Solutions:

a.Test whether the charger has voltage and output electric current or not.

b.Check if the charger is well contacted with battery.

c.Activate the battery with voltage and current 1.5 time higher then the highest ones of battery. (Use this method only when the battery can't be charged.)

The other replacement Dell laptop batteries such as Dell inspiron 700m battery, Dell inspiron 710m battery, Dell inspiron xps m140 battery...If one of them can't be charged,the reason maybe so.