Can't fault eBlink for fast shipping, however item arrived without any additional packaging (shipped lose in envelope) which raised my suspicion. Turns out the battery shipped was NOT an original BL-5J battery as advertised, it was a clever fake, holding significantly less charge than the original battery (between half and 2/3) and also fails to report its discharge properly. It does not slowly discharge and then prompt low battery warning, rather it shows as 100% charge until suddenly the device powers off with little to no warning.
NOT HAPPY.
I have nothing against 3rd party batteries when they are sold as such, however I like to make an informed decision and in this case I would only have purchased an original battery.
For a third-party battery, given the above information PRIOR TO PURCHASE, and not passed off as an original, it might be acceptable.