My dad got one of those rechargeable USB battery packs and it recently failed, on opening it I found a charred resistor that was hard to read. I managed to make out 1R but the number after the R was hard to read, it looked like it could be either 1R5 or 1R9

. I tried to use a soft brush to make it easier to read but that just made it worse

, any guesses as to the value?
The link is a pic of the resistor after the brush attempt :