Never get an aftermarket one, It will damage your smartphone.
Aftermarket batteries are not the issue, it's how they are charged/recharged.
Almost all batteries are made in China, even Motorola batteries have been made in China for years, and not just the cellphones, but their two way radios as well.
I have purchased hundreds of aftermarket batteries for my customer's portable radios, and have had only two returned due to bad cells, so the defect ratio is fairly minute from my experience.
A business I have purchased batteries for phones called 'Factory Outlet' has been providing my with batteries that have held up very well over the past year, and i have yet to have a single failure, or one returned due to charging issues.
As with anything, there will be defects, you can not avoid them, but labeling all aftermarket batteries as a potential problem is wrong, and assuming them to be the cause of damage is also improper.
I have had brand new Lithium ion batteries from Motorola's land mobile products go tango uniform, they were recent date codes, but failed to charge even once.
Before I recycled them, I had boxes of almost new batteries that died before their time, from all manufacturers, for hundreds of devices, from phones, two way radios, tablets and even PDAs like the iPaq and Palm.
Motorola, Bendix/King, RELM, Tait and Harris, all died in short order before they should have died, manufacturer makes no difference, name brands don't prevent defective cells from being released to the consumer.