Laptop Repairer Interview Question:

Dell 1525 Inspiron that says system does not recognize the installed battery this system will not charge the battery?

Submitted by: Murtaza

Charging battery in Dell laptop involves two major chips: EC(or someone call it super IO), PWM chip for battery charging. BIOS has no part of charging. Battery communicate with EC through SMB(system management bus??) and EC controls charging PWM. Fix charging problem is very hard in laptop repair, you must fully understand schematics, where all the signals come from and where to go.
Today's laptops are less and less with programmed EC, Dell 1525 has no programmed EC so it can be replaced with same model.
Submitted by: Murtaza