Home laptop battery FRONTIER R/FRNU503 Series batteries Compatible Laptop Battery for FRONTIER R/FRNU503 Series Click to enlarge Find other parts of your FRONTIER R/FRNU503 Series Code:1 Special price: $AUD Number: Brand new product with 1 year warranty! This R/FRNU503 Series batteries replaces: This R/FRNU503 Series batteries is compatible with the following models: