I am looking for a new battery for a Gateway MT6839B laptop. The current battery is a 6 cell 6MSBG. A number of replacement battery vendors, including this one, seem to imply that a 12 cell will work as well. On the whole is this the case? Is a 12 cell battery compatible with a machine that was delivered with a 6 cell battery, provided that the voltage/amps/watts/etc (I am not an electrician!) match?

Thanks in advance for any general advice.

Rich