HP 35s battery drain

[math7]

(07-25-2020 06:24 AM)grsbanks Wrote:  I don't know what batteries you're using but cheap Chinese no-name lithium batteries are going to have much less life in them and perform nowhere near as well as batteries of a reputable brand.

This said, that the first set of batteries only lasted 3 weeks should have been a good indication that there was something wrong with the calculator. It is very likely that one of the decoupling capacitors inside it is leaking.

If your calculator is still under warranty then take it back. It is faulty. If not then you're probably better off getting another one.

The batteries that I have put in are a good brand ... from a brand that starts with m and ends with it, and from another brand that starts with S and ends with Y so as not to advertise, haha. Yes it must be defective, but the warranty passed more than 1 year ago, because I did not use it as much and sometimes had it stored.