Bike sat for 3 months, pushed starter and it died

[EazyDuz]

Suzuki C800.
I last fired it and let it idle in December. It has been on a 1.25A tender ever since.
Turned the ignition today, everything lights up, can hear the fuel pump whirring, press the starter and the whole bike went dead. No lights, no signs of life at all.
Checked all the fuses, none have popped. Dont have a 9v oblong battery for my multimeter and Boris wouldnt approve of going out to get one so any ideas what its likely to be?
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To shreds you say? Tss tss tss

[Riejufixing]

1) Check battery terminals. 2) Fuse? 3) Erm...

[stinkwheel]

You can use a battery and bulb as a continuity tester. You can take an indicator off and use it to check for voltage at various points in the circuits. Start at the battery and work forwards.

Try shorting across the solenoid posts and see if it turns over. That will tell you if the battery is good and the starter motor is working.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[EazyDuz]

Its the battery. Kept the bike in the on position and pressed the alarm (which is simply wired by itself to the battery terminals). The alarm sounded then stopped working, drawing what tiny amount of power was left in there
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To shreds you say? Tss tss tss

[Polarbear]

That charger you were using? Was it an auto/trickle for a bike because if it's been trying to shove 1.25A into the battery for 3 or so months it could have contributed to it's demise.
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Triumph Trophy Launch Edition

[EazyDuz]