Sort of a weird question, but does anyone happen to know the specs and make/model of the battery in the Hyperkin Retron 5 Controller? The reason I'm asking is 2 fold. A friend donated a controller which had a busted battery (which he conveniently threw out...clever I know) and I'm looking to get a replacement battery. Also, I have a Retron 5 system coming from the US as a Christmas gift and of course Australia post won't let me get the thing shipped without a Material Safety Data Sheet.
I would appreciate even just a pic of the thing with some code numbers to start investigating, but if anyone knows more about it than that, the info would be much appreciated.
(ps I know people hate the controller, but I actually quite like the stick)
(pps... this pic is my only lead, found on another forum... green is possibly the battery.... credit to Ellie Doodle on Element14 for the pic)