How long does the single AAA battery last?

The ELECOM M-DT1DRBK & M-DT2DRBK run on AA batteries, not AAA, btw.I bought my first one model M-DT2DRBK on July 16th, 2016. Been using that one at work, 5 days a week 8-9 hours a day. I have replaced the batteries 3 times since then. So my desktop one seems to be lasting me 2.5ish months. I bought a second one model M-DT1DRBK on July 24th, 2016 and keep in my EDC bag along with my Acer 2-in-1 for use near exclusively with Photoshop & Lightroom. I keep that one powered off when not in active use and I've had replaced the batteries just once.I'm sure if I bothered to click the bottom of the work mouse to power it off on weekends and at the end of my shift it would help with the frequency of battery change outs, but I'm lazy. And the mouse is more than worth keeping a pack of AA batteries around at work. I'm actually buying a 3rd ELECOM for desktop use away from work. I don't see any difference in quality, functionality, size, or appearance between the $55 M-DT2DRBK and the $44.90 M-DT1DRBK, TBH. I'll probably just snag another M-DT1DRBK.

There is a switch next to the "middle button" or scroll wheel on the side of the trackball. Anybody know what this switch is for?

It determines how fast the pointer moves as you rollt he ball.

Is there a user manual pdf in English available?

here's a link to the pdf manual: http://www.elecom.co.jp/global/download/manual/pdf/20160223_MSC-M-DT1UR%20Ver.111.pdf

Does anybody have problems when double clicking? I have to try multiple times for it to work. (I haven't set any button to double click)

Yes, I frequently have problems both single- and double-clicking. I often have to hold down the button for about a second for it to work. I also have to wait for a minute or so for it to work at all after turning on my computer or "waking it up" from sleep mode, during which time I'm able to use my wired mouse.

Brand	ELECOM
Series	ELECOM
Item model number	M-DT2DRBK-G
Hardware Platform	PC, Mac
Operating System	Windows 8, Windows 8.1, Windows 10, Windows 11, macOS 10.10
Item Weight	4 ounces
Product Dimensions	3.73 x 4.9 x 1.89 inches
Item Dimensions LxWxH	3.73 x 4.9 x 1.89 inches
Color	Black / Red ball
Power Source	Battery Powered
Batteries	1 AA batteries required. (included)
Manufacturer	ELECOM
ASIN	B08GQZVH78
Date First Available	September 9, 2020

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