Does "I have tried to get another battery" mean that you are still using the original battery?
If a known working charger does not charge the battery then the problem is either with the existing ProBook battery or within the ProBook itself.
The only way to narrow that down is to buy or borrow another known working ProBook laptop battery. If that battery fails to charge then the problem is most likely within the ProBook.
Another option is to find a reputable shop that can run the diagnostics on the ProBook. Most likely that will cost you some money.