It's all down to the individual traders rather than ebay - they must be under intense competition though from the Amazon - order 'Saturday night and have it delivered Sunday afternoon' new normal.(must get out more after Covid)
I did order a new battery for this very laptop from ebay for £15 a couple of weeks ago and could not get it to work despite pratting about with seller guidance. Ordered a £23 replacement from Amazon and it worked straight away.
Ebay seller accepted this, refunded and told me not to bother returning it.
Both batteries were from China and looked very similar similar, so think the ebay item was just unlucky.
You know it makes sense! 
