You shouldn t have much or any drain on your battery with a stock electrical system on your KLR. Do you have any other accessories added to your electric system? If your new battery is discharging, I d disconnect it from your bike and see if it still discharges at the same rate. Even new batteries have been known to fail out of the box. (Yuasa not so much) Most all lead acid batteries will self discharge and that is normal.
https://en.wikipedia.org/wiki/Self-discharge AGM batteries also need to vent and just because it is sealed doesn t mean it can t vent. So filling the battery and sealing it right away shouldn t effect the way the battery works. I d let it set a little while before putting the first charge on the battery. Acid changes the lead in your battery chemically. The lead in your battery is porous and it takes time for acid to find it s way into all the nooks and crannies of a lead acid battery, so if you put a charge on the battery too early you may limit it s potential. Also charging at a high amp/hour rate the first time is a bad idea. The first charge should be at a trickle rate, less than two amps and the lower the better. Lots of good battery info here:
https://www.yuasabatteries.com/resources/faqs/ Fred
http://www.arrowheadmotorsports.com
[b]From:[/b] DSN_KLR650@yahoogroups.com">david zawadzki fordavidz@... [DSN_KLR650] [b]Sent:[/b] Tuesday, October 2, 2018 8:43 AM [b]To:[/b] DSN_KLR650@yahoogroups.com">KLR Group [b]Subject:[/b] [DSN_KLR650] Battery Drain
Hello folks, Is it possible that while a bike is in an off position something is draining the battery? PS- got a Yusa maintenance free battery, added the acid, and closed it pretty quickly (dumb mistake) heard some gasses trying to escape.....did I ruin the battery? How important is it for the battery to sit for 20 min before sealing it? Thanks. --
David Z mobile: 646-267-1109 poisonpartyband.com