/diy/ - Do It Yourself

my laptop is having an issue where it will not charge the battery but will draw power from it (when not on ac). currently the pack is almost drained so i want to bring it back up to make sure it doesnt lose lifespan from being discharged for however long it takes to deal with this. how do i charge the pack with a power supply? it is an 8 lithium cell pack that gives 14.8v and 5200mah so im assuming its 2 parallel sets of 4 cells in series rated at 2500-2600mah each. it has whatever protections built in that you would assume any laptop battery pack would. what is the voltage and current limiting i should set my power supply at and how will i know that the battery is done charging?