Pulsar 902 Calculator Not Adding Correctly

[wzy-hman]

I'm finding that my 902 is occasionally adding an extra one when I do a +6 or +8 eg 4+6 can give 11 ! Anyone come across this problem before and any ideas on how to rectify it? The watch is otherwise working fine including keeping time, date etc and flick function works smoothly. Thanks in advance for your advice and suggestions

Update: a fresh set of Renata batteries did the trick. It hadnt occurred to me that weak batteries could cause illogical behaviour

[lex]

What batteries did you try?

I have a 901 doing something similar.

It's supposed to have new batteries but maybe they are the wrong ones or underpowered.

Time works great, but calculator doesn't set on with a "0' button press...

[wzy-hman]

4x 357, I usually use Varta or Renata