My suggestion would be to connect a battery maintenance system to your battery so then you just plug and unplug the device. I would start with a new battery and Yuasa is generally the best. Then I have used Accumate in the past and then I discovered the Yamaha branded one which is made by CTEK and I now have about 4 and my bike batteries now last even 5 years, cos I always connect one when I am not using the bike. Er well bikes, cos I have several!! Have fun.

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....