here in the UK, oem batteries are considerably less than those from the laptop maker.
l have never had a problem with using oem ones (even with an Acer laptop).
I make sure I buy the correct ones by matching against the part number(s) on the original battery. Also I select ones with the same number of cells, but higher wattage and a guarantee, which are not necessarly the cheapest.
Compare those from both Ebay and Amazon. A problem with Amazon is, it appears impossible communicating with the seller if needed, prior to purchase.
As a matter of interest, where are you located? I am in Hammersmith, West London.
Good Luck - Keep us posted.
message edited by Mike Newcomb