I have a Remington 570 and the same problem ocurred.Take the head off and to open the shaver there are probably 2 screws in the rear (recessed} and you will probably find 2 rechargeable batteries soldered in.I ordered 2 batteries on the internet and simply unsoldered the old ones and fitted the new.I used a small amount of blue tack to hold them in place.Charge for at least 24 hours and bingo!
George Bowden, October 2008