First Month with 50g

[rprosperi]

(04-22-2015 08:11 PM)Voldemar Wrote:  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?

I agree with Han; it is likely your original batteries are years old, which is why their life was short.

The SD card being inserted has negligible impact on battery life - however writing to the card often could make a difference, although this too is small.

The purpose of the backup battery is to keep the RAM intact when the main batteries are removed/changed. Never remove the backup battery when the main batteries are removed - you almost certainly lose all memory. However once you have installed new main batteries, it's OK to replace the backup.

Also, keep in mind that Port-2 is FLASH RAM, so you should backup your RAM to Port-2 often, both in case of battery failure, and also in case you start exploring some of the low-level and System-RPL features, which could lead to lost memory, but FLASH is not affected. There are many backup programs available at hpcalc.org.