Charge board screen display and button - what do they do ?

[Liam]

Hello all ,

I've got a p3 and 2 batteries . I recently bought a parallel charger board and there is a button and a screen display that I have no idea about .

I thought it important to ask what the button does and what the little display is telling me. , I don't want to wreck my batteries there so expensive
I've added a pic

Also I bought it off eBay it was £10 . Is that dodgy ?

Can anyone help me ?

Thanks .

 

[MoreGone]

I think you're supposed to press that button if you plan to use the remote charger instead of the battery charger.