Lithium battery going (very) flat?

[jlparsons]

I changed over to a lithium iron phosphate battery a couple of weeks ago on my BMW F800GT and after an initial charge everything has been going fine until yesterday when I go out to the garage and find it utterly dead. Not even the clocks flickered when I turned the key - never seen a bike that dead.
I plugged it into a lithium-specific battery conditioner which said it was at very low volts and automatically slow-charged it then fully charged it, so now everything appears perfect again but obviously I need to know what caused it so I don't risk getting stranded somewhere!
The alternator is kicking out 14v and the current drain with the bike turned off is 1.8 miliamps, so that appears all good. Best I can tell there's two options;
1. The battery has had sex and needs returning.
2. My recent short journeys with the heated grips on have drained more than the battery is being charged, causing it to drop. This seems unlikely to me?
Anyone else experience similar issues with lithium batteries?

[Fisty]

Sounds like the battery is borked.

Both mine have sat since september last year and started first prod.
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[doggone]

Is it out of the question something was left on, like the grips.
I would see how it goes for a while, you might have something intermittently faulty draining it.

[jlparsons]

[Hong Kong Phooey]

[temeluchus]

[Grubscrew]

One way you can find out if there is a battery drain, if that’s what it is, by exposing fuse box, remove each fuse and slowly put it back, and if you are able to do this in low light levels you may just see a tiny spark across the fuse terminals. Worth a go if it’s possible.
With ignition off
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FJR1300/CBR1000F

[Motorhate]

Worth bearing in mind that the cold does affect Lithium batteries more than lead-acid / gel type batteries. It's the only thing that's putting me off getting one as they weigh next to nothing.
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