CWK High Performance Pro Series HP ProBook 4520s Laptop Battery - 24 Months Warranty

When my 5-year old OEM ProBook battery deteriorated to the point it would totally discharge in one hour, I decided it was time for a new one. I ordered one of these and although I ran it down to 10% several times and charged it back to "activate" the cells, as advised by their CSR, it never lasted over an hour. The CSR also tried to tell me that 6-cell batteries were not supposed to last over 1 hour, but he failed to note that, although my OEM battery was a 6-cell, this one was actually advertised as 9 cells. Suffice to say, I returned this substandard product.

DO NOT BUY FROM THIS SELLER!!!! Purchased this in December of 2015. Finally installed late Jan. of 2016 and worked great. Now the battery no longer takes a charge. Have contacted Amazon, was told to directly contact CWK. Contacted CWK 2 times and still no response back. The main reason i purchased this was because of the 24 month warranty and its worthless. DO NOT BUY FROM THIS SELLER!!!! CWK® High Performance Pro Series HP ProBook 4520s Laptop Battery - 9 Cells - 24 Months Warranty

Garbage. From the first this battery didn't hold a charge. I initially thought that 1 or 2 complete charge/discharge cycles might help but I was sadly disappointed. The 2 year warranty is also garbage, because several attempts at contacting CWK proved fruitless.I recommend staying as far away from this as possible!

Es buena

this was shipped ASAP and was put in right away. I'm using the laptop without the cord to make this review. Great seller great product.

Product worked well for a few months, however after 6 months or so, the battery started to noticeably lose charge. I believe the seller is selling used batteries instead of new ones.

Crapped out way too quickly

is working as expected.