I recieved a used acer travelmate 4150 it is good but it can't find the battery so I purchased a new one with the no# that in the old one but the laptop was not able to find the new battery. I traied to attached the battery in many way but nothing happend >>> any one can help >>>sorry for my poor english
you can also use your laptop without the battery, just plug its power cord while using for the mean time, the battery may be has low charge to the point that it can't turn on your laptop, insert your battery then plugin your power cord to charge your battery