HP/Compaq NX9420 battery. What voltage??

[rnkd84]

My old friend (NX9420) is still going strong but the battery is totally used up. I have searched for a new one but i can`t find information what the diffrence is from 10.8V, 11.1V, 14.4V and 14.8V. Can all the batteries with whatever voltage be used on any model or do i have to replace the one i have with a battery that have the exact same voltage? I have searched both the community and the web for several hours without finding an answer. Some says that you should not use a diffrent type of battery than the one you had and some says that it is okey to use any of the diffrent types of batteries with whatever voltage. Can someone please help me with an final answer? 😁

[Prométhée]

Hello
as a general rule you should use models recommended by hp and compatible with the model.
Therefore, choose a battery that does not respect certain elements, may not work, at worst damage the computer.
this model being quite old, it may be complicated
I don't know if it is this, but I am amazed I found the product page

HP Compaq nx9420 Notebook PC Product Specifications

several models are mentioned, but not very precise here

Identifying genuine HP adapters and batteries

see here there are normally the references

 HP Compaq nx9420 and nx9440 Notebook PC - Maintenance and Service Guide