I don't agree with what you have done. Service manual wil not do help at all， it‘s hard to repair your battery by yoursel.:roll:
Laptop battery is a consumable item, the battery life depends on its charge and discharge times, as long as he decided his life (more charge and discharge times will make its actual capacity get lower and lower than the design capacity, when reach the end, the battery is over.) You can check out the battery warranty, then get it repaired by aftermatket centre if it is still under warranty. the lowest usage time for hp is less than five minutes or 15 minutes) If you don't use the battery frequently and just been kept it inside the computer with the AC external power plugging in , the main cause of this problem will be some memory error from battery memory chip, maybe you can try to deeply discharge your battery .........
what you should do is to set you laptop as not shut down, not standby when the battery capacity is lowest(drained its power), you can change such setting in the advanced settings in the control Panel power Options. then make the battery be fully charged, boot your computer without an external power, which can discharge your battery completely. you can recharge it when reach to 0%. Make the operation cycled 2 to 3 times, then the correct memory of your battery will be restore.
Off course, if your battery is aging, it's highly recommended for you to buy a new battery replacement. I once bougt one at
**broken link removed** , also fit the HSTNN-LB0C, the item works well, above all ,the price is reasonable. Off course , ebay will be a good choice also.