HP 35s Battery Life

[Mox]

Hello everyone,

This is my first post here. Having agonized over a choice between an 11C or 35S I finally settled for the 35S as an entry into the HP fold. The 11C is, in my personal opinion a better looking machine, but I felt the 35S would hold up to being transported around at work more reliably.

My question is regarding battery life, as an engineer I use my scientific calculator for about two hours a day most days of the week and looking at images online the 35S appears to use 2 x 2032 button batteries. Has anyone experienced issues with time between battery changes?

Still looking at online auctions for both an 11C and a 41CV purely for aesthetics and nostalgia I feel I need to have these in my life. Shallow I know but hey there it is.

Thanks

Mox