I changed the battery on bathroom scale Salter 987

I had the same problem with my Salter 987 scale. Pull the battery out for about 10 seconds and put it back in. Then push the scale once so it turns on. After the blinking stops, push it once more. The scale will now zero itself. After the scale has zero'd itself it may turn off after a brief moment. It's now ready to use normally. If you're standing on the scale when it's trying to calibrate to zero, it will assume your weight is zero. Don't stand on the scale after replacing the battery untill you first complete the steps listed above.