jlparsons

Hi folks, have changed my BMW F800GT over to a lithium iron phosphate battery after my old lead acid one finally died. The lithium one has been working fine for a few weeks then suddenly one morning I come to start my bike and it's very, very flat. Like not even a flicker from the instruments - never seen that before. Usually when you have a flat battery the instruments come on and you at least get a click from the starter solenoid before failure to start. I connected up my lithium battery conditioner which said the battery had extremely low voltage so it automatically did a slow start and then charged it. Now it's working fine again, but obviously something has gone wrong somewhere and I don't want to get stranded somewhere... I've been doing lots of short trips and have had the heated grips on, so I'm thinking that might have done it by pulling more charge out than the engine is pumping back in over a couple of weeks, but seems very unlikely and wouldn't kill it absolutely flat like that surely? I've checked the alternator output which was fine at 14v, and the current drain with the bike off which was 1.9 miliamps. So I'm a bit at a loss. Anyone experienced similar phantom current drain with lithium iron batteries? I've now taken the battery out of the bike and connected it to the conditioner which will test it over the next 24 hours or so for voltage drop after charging.