[iconoclast]

I use the CTEK Cig lighter adapter to charge my MY216.
Works fine, does not shut off.
"CTEK 56-263 Comfort Connect Cig Plug" $11
[ame]https://www.amazon.com/CTEK-56-263-Comfort-Connect-Plug/dp/B0016LA5O8/ref=pd_bxgy_263_img_3?_encoding=UTF8&pd_rd_i=B0016LA5O8&pd_rd_r=7fa9e0c8-ae7b-11e8-97de-971d4c54e3db&pd_rd_w=vDupj&pd_rd_wg=t65FS&pf_rd_i=desktop-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=6725dbd6-9917-451d-beba-16af7874e407&pf_rd_r=MGKJDPZ62NHDBXMHMWQD&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=MGKJDPZ62NHDBXMHMWQD&dpID=31NAjAhv8kL&preST=_SX300_QL70_&dpSrc=detail[/ame]

YMMV

There is a long thread re this & other info on CTEK charger.

 

[iconoclast]

Had my 23 month old 17s with 8500 miles battery replaced today. And it was NOT under warranty do to not driving 6000 miles a year and no trickle charge used.

part (958-611-092-21)/labor. The dealer charge 671.00 with a 20% coupon.

Did the dealer say that they updated the computer re new battery?

There is some controversy re whenever this is needed or if it is b.s. to scare people from just replacing their battery themselves. Especially with a more powerful battery & certainly for a lot less money. $671 is way overpriced & that is with 20% off.

 

[iconoclast]

It's happily charging.

Another question - a couple of times when starting the car, I had been hearing a warning that the battery was low. Is that something to worry about? (I think it had to do with the fact that I was leaving the radar detector plugged in and the car keeps power to the outlet for 30 mins after shutoff.)

Hardwire your Radar Detector. There are a few threads here on MF with details.
You want a fuse that is OFF as soon as you turn off the ignition.