First Month with 50g

[Tugdual]

(04-22-2015 08:11 PM)Voldemar Wrote:  Last month I got my HP 50g Blue. Yesterday on my new calculator the low battery icon begun to display. Icon is strange. Looked at, only 40 days since I start to use the calculator. Today I replaced all batteries (4 AAA batteries and backup battery). Is it normal, batteries on HP 50g last only 40 days? I use HP 50g infrequently, while learn to operate. Much more I use my good old HP 35s. I have inserted SD card in calculator. Do SD card permanently in calculator drain batteries faster? Or it does not matter? And, is it necessary to change backup battery every time the low battery icon displaed, or backup battery lasts longer than main AAA batteries? Thank You for answers.

I observed the same and was shocked. I have replaced batteries by low self discharge rechargeable batteries. Next issue will be voltage. If I'm not mistaken the low battery detection is solely based on voltage and will trigger soon since rechargeable batteries are operating around 1.2V versus 1.5V for normal batteries. Therefore you may have to recharge batteries when only 33% of the available energy was drained. I wish I could have a 50g custom firmware to adjust alarm voltage to lower values more adequate for NiMh batteries.