I have researched and read-ad nauseum, about the various expert, old timer (of which I am one)opinions on the subject of a battery charger-tender for the Gen 2 GT- oh-my head hurt. Now, I ride all the time-but there are a few weeks--vacation, work, when J-Low sits in the garage just waiting for me. :yeah Its not the cost of a battery, but the annoyance of a non-start. Saturday I went over the my dealer and found the Powerlet kit to plug into the back of the acc socket and then directly to the battery to by-past Herr Can bus, thus having a non-switched plug for charger--etc. Ummm I said to meself-, I don't use heated stuff--even in N/Cal it never gets that cold ( for an x-NYer). Crackberry gets charged in motels on road trips. GPS has its own plug up front where Bmw put it. So, I only need a convient place to charge the battery. The kid- (anyone under 50 is a kid) at the parts counter asked if he could help me. Told him my desire to KISS (Keep It Simple Stupid-not him) and he walked away. He came back with the owners manual for the BMW GT specific charger pt #71607688865. We read it and wowww. That's exactly what I want. Stage 1--Max charge, Stage 2 volt is preserved with falling current to bring battery up to max asap. Stage3 volt is reduced to maintenance charge. Stage 4 reduction in volts causes a reset-cycle starts again from beginning-"no need to do anything-circuit has remained open". 5 LED's, power, 0, 1/3,2/3 and 3/3. "Battery cannot be overcharged". 3/3= battery is fully charged Maintenance charging is taking place. Unit can remain connected. The battery is maintained in so called "driving simulation cycles" " The unit can remain connected for several months w/o any problems-overcharging is prevented. $140-15% discount for folks who are chocked full of internet misinformation-opinions and just plain confused.
Ok--pluged it into the electrical socket-led-power on, pluged into acc socket under left knee on bike. LED 0-on--charging. OK. No where does it say to go thru that on-off ign, unplug-replug-drop you drawers and stick it up you bum routine. How do I know the circuit on the acc plug was open you ask--cause I have Hyper-Lites spliced into the back of the ass socket wire for power. When I turn off the ign--these lights stay on for 40 or so seconds and the acc circuit shuts down. The Hyper lights were lit meaning the circuit is open. Charger went through 3 stages to final maintiance in 24 hr period. (I know what you're thinkin--your Hyper lits are on the whole time dummy--yea--led's have a very low -miniscule current draw and don't burn out--well not like a filament bulb--so ok.
No fuss-no muss--no cuttin holes on tupperware for a socket--no extra wires to fish around stuff and nottin for the dealer to say--you shouldn't have done that --its not BMW approved--warrantee void.