Parasitic drain on the battery?

So I neglected to keep the Shorai on "Storage " mode and killed the battery. Time to order another. Has anyone figured out what the drain is?
 
So 2 weeks ago I replaced the tachometer with another that came from the factory. After 8 days sitting (no charger plugged in) the bike started without any issues. This is a first for my bike as it always required to be left on the charger prior to have any hope of starting after a spell of a few days.
 
speirmoor said:
So 2 weeks ago I replaced the tachometer with another that came from the factory. After 8 days sitting (no charger plugged in) the bike started without any issues. This is a first for my bike as it always required to be left on the charger prior to have any hope of starting after a spell of a few days.
Click to expand...
I use stock Yuasa lead acid. 5 days off the tender, the bike will start, but the digital display will freeze and the tripometer resets to zero after 20 miles or so. A day or 2
on the tender, all is well again.
 
Britfan60 said:
I use stock Yuasa lead acid. 5 days off the tender, the bike will start, but the digital display will freeze and the tripometer resets to zero after 20 miles or so. A day or 2
on the tender, all is well again.
Click to expand...
Do you lose the time also?
 
A parasitic drain test is pretty simple to do. My sport came with a yuasa battery that lasted two years on a tender. Can't blame that on the Norton. My Triumph Bobber came with a Yuada and it died two years later on a tender. Just junk batteries.
 
I've always believed Yuasa to be the best but I must admit that the last Yuasa I bought doesn't seem to be quite as well made as previous ones.
My old CB750F2 has only had three batteries in forty years (never on a tender)! The old fashioned top-up type though - which must say something. Gel type Yuasa for my CBR1000RR lasted seven years (not on a tender). The only problem has been my Triumph Scrambler which has been through three in ten years, two Yuasas and a Lucas and which have been on a tender due to it failing to start more often than not when I came to ride it.
I did find out to my cost one problem with tenders - they can mask other problems. One day I went out for a longer ride than usual without stopping, about an eighty mile round trip. Once home, unusually I needed to use the bike straight away again, when to my surprise it wouldn't start. Turned out to be a faulty rectifier. Basically nothing had been draining the battery when the bike was standing, it was riding the bike which had been draining the battery, something which had possibly been happening for years and I didn't realise because every time I arrived home the tender had been charging up the depleted battery.
 
The factory traced my parasitic drain back to the speedometer which they replaced.... the new clock was zero mileage but will soon be ready for its 2nd first service :)
 
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