I purchased an ex-display model of an HP ENVY All-in-One-27-b205na from Curry's about a week ago. There was no box or any documentation - indeed, all I had was computer itself, the power cable, mouse and keyboard. I have now discovered that the keyboard has rechargeable Lithium batteries (that cannot be replaced) that need to be charged periodically. No cable was supplied for me to do this, but I have one such cable anyway. My question is this: how long does it take the keyboard battery to recharge. There is no obvious LED to show this, I cannot find instructions online and the HP site does not tell me this information.