Laptop Battery - Dell D520

[Ironic Namesake]

I want to buy a a second battery for my laptop, have been searching google for a while and still haven't figured out which battery will last longer :

C1295 or M9014 ?

Anyone have any ideas Thanks in advance

 

[Amonlym]

according to the maths and about 3 seconds on google..

M9014 = 58w/hr
C1295 = 53w/hr

so its pretty much equal. but dont take that as gospal.


basically, find out what the voltage and capacity of each are. multiply volts by amp hours to get watt hours (4000mah = 4ah fyi)

higher w/hr = longer run time.