My electrical issue remains, abnormal voltage drop when bike are resting in the garage. I'm out of ideas or is this voltage drop normal?

If anyone could measure there battery voltage after X untouched days after fully charged it would be interesting to compare with.

what accessories do you have?

usb charger? anything else?

as mentionned before, it is a quite acceptable loss....

mayeb you can check the regulator (just in case). i had a loss on my other bike, and the regulator was in fault - test it just in case....

Look I'm not an electrician by far, but analyzing your first post I noticed that you said you stored the bike with "key in state off". Does that mean the key is left in the ignition of the bike?
Then a bit further you said that fuse 7 that was draining the most amps was related to the immobilizer?
I've noticed in the past that my bike's immobilizer light would keep on flickering when the key is near the bike. Surely the bike is "talking" to the key when it's in the ignition? Could that consume more electricity?
You don't think it's worth removing the key from the ignition and then check if the battery is still draining? Just an idea

Hi Mathias,

I have the same problem with my XT660Z (ABS) 2011.
Could you found the reason of abnormal voltage drop?

This morning the battery capacity was so low it couldn't crank the engine - and I wasted over €100 on the ferry i missed ;-(

It had been standing still for 2 weeks and last time when i got home i've played a bit with light since it had melted my low beam socket due to a bad connection. I didn't think that i used much power but had started the engine a hand full of times without letting it run for long

Since my battery is now 7 years old and have been completely drained at least twice I guess that i could just as well replace to rule it out, since it is past it best days.

On previous motorcycles with traditional wet batteries i i usually have replaced the battery after about 4-5 years on average.

Any recommendation for a the best replacement battery for the pony with ABS ?

Yuasa/Bosch have allway's worked well for me.

my XTR 09 is still running the original yuasa. No doubt its capacity has reduced but still dependable.


you need to decide which technology you want : lithium or lead