I've used non-OEM batteries in my laptops for years. Quality is variable. Some have lasted at least as long as the originals, while others less. It seems to depend on how old the cells are. At one point I bought OEM batteries from other sources, but they may have been overstock and old. Some of those only lasted a couple of months. So, I've generally gone on eBay and bought mine. If they die, I haven't spent a lot. I've not experienced any problems with my laptops with non-OEM batteries, either.
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