Battery woes

[MEM62]

If an OEM replacement only lasted 3 months I would assume that it must have been faulty.  You have mentioned that cheaper replacements have lasted longer and this shouldn't be the case.  It is worth checking your charging system just in case.  This is easy to do and a multimeter, if you don't already have one, is relatively cheap to buy.  Your commute is relatively short and will not put much of a charge in the battery anyway, but your ovenight charging should easily compensate for this.  As for the alarm, some are worse than others for trashing batteries.  Personally I won't have an alarm fitted to either of my bikes for that very reason.  My FZS1000 has never had an alarm fitted but my VFR came with one - the cost of having that decommissioned was around £50.