Dennis has asked a question via PM on how to replace the LNT battery, I thought it may be an idea to post here so others can find it.
Appendix D (page 54) is the section you're after in the LX90 manual.
Follow
this link to download the manual if yours isn't up to date.
It's a fiddly job (not difficult) and you will need to realign red dot finder and recalibrate the sensors after battery replacement.
The battery type is a lithium CR2023.
