I have a HP DV3510nr . Yes its an older laptop, but works just fine for what it is. Well, the battery just died, to where the system doesn't even recognize it. I started looking for batterys, and it seems they are sketchy at best, saying refurbished, new HP, but with different number etc.
Is there a genuine place that sells solid batterys for laptops you recommend.
Thanks

https://www.laptopbatteryfactory.com/hp-dv3510nr
 
This battery has a 1 year warranty

All laptop batteries are built to handle a certain number of charge cycles, usually somewhere around 500 full cycles — and sometimes even more. Essentially, a charge cycle equals one full discharge down to zero percent and then a recharge back up to 100 percent. A discharge down to 50 percent and then back to 100 percent would equal half a cycle. Over time, each charge cycle decreases a battery’s capacity from its design specifications, meaning that the fewer times you drain it, the longer the battery last — all other things being equal.