Originally Posted by
peterb
As watercooled says, itr isn't an OEM device, it is an aftermarket, sold by an Amazon associate. At £13 you can't really go wrong even if it packs up in 12 months - and the reseller is British based so there is less risk than buying off an auction site.
The PSU doesn't usually charge the battery directly, there is usually a charging cct in the laptop, so provided the output voltage is suitable and the unit can supply the required current, there shouldn't be a problem.
That said, if you have any concerns, by a branded one, like the FSP watercooled (again) referred to.