Join Date: 08-25-2008
Location: La Linea, Spain
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Re: Battery change
Fair enough trying to help but presenting uninformed opinion as fact is how the internet doesn't work.
To add to your own knowledge: think of a battery as a bucket and electricity as water. The starter will need a certain amount of electric to get it going, and that must drain from the battery. If the battery is smaller, then it could be there isn't enough water pressure (cold cranking amps) or it could be the water is all gone before the starter did its job.
I know the 400 has an 8Ah battery, I believe the 929 has a 9Ah battery, which is hardly any difference at all. It doesn't take much wear and tear for a 9Ah battery to only hold 8Ah so a strong smaller battery will be fine, I just wanted to point out if the smaller battery is weak it may cause issues. But nothing's gonna melt nor fail in use due to a smaller battery.
Ride with lights off where possible, unplugging one headlight connector will help a lot if you are riding only/mainly in the night.