IBM T43 BATTERY PROBLEM

[kanewilliam]

My t43 old battery was not charging anymore so i have kept it a side . I have bought a 12 cell battery for my old compaq v2000 and it was working fine , suddenly my compaq laptop died , so i have got a plan to exchange the battery from the compaq to ibm battery . I have done it through a professional and the output is 10.8 volts correctly . when i insert the new battery in ibm t43 after booting it freezes in windows and the amber charging light always shows like its charging but its not charging the battery if i remove the ac adaptor the laptop immediately dies without giving backup from the battery . Its not even charging the battery and its not giving backup from the battery what could be wrong help me with this .

[RealBlackStuff]

IBM batteries contain electronics, which are totally different from other brands, like that Compaq battery.
The output voltage may be correct, but the contacts are probably different as well.
If that 'professional' had been professional, he should have told you this!
By inserting this Compaq battery, you killed the charging circuit.