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Originally Posted by hall13uk
i was once told that 15mins of normal (going through all the gears) riding will fully charge the battery.
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I think you may be confusing charging the battery with putting back in the battery what was taken out by using the starter, If your battery is anything like run down it'll take a whole lot longer to fully charge the battery, especially on a more modern bike with the lights on permanently.
It's a reasonable rule of thumb that a fully charged, good condition battery will lose about 1% of charge per day, so as a usable figure, (it's
not exact so don't consider it so), a battery will be nearing exhaustion after about three months, assuming no load that is, so no alarm. Whether your bike will start at that point depends as much on how well the bike starts and runs anyway as it does on battery condition.
FWIW, the worst way to treat a battery is to neglect it, the best way is to use it, it might be a nice idea to have the bike ready for use randomly all the time, but unless you remove the battery every so often and give it a top up, say six to eight weeks, (better still take the bike for a run), it may not be there for your use when you want it.