I’ve stupidly let the battery go flat on SF V4 SP2. It appears as though the official trickle charger died at some point over the winter. I’ve bought a new charger and plugged it in but I’m not getting a ‘charging indicator light’. Any ideas on next steps?
I think I read Lithium batteries don’t handle deep discharge (< 10v) very well… They also don’t like cold temperatures. Did you measure the battery voltage ? It might simply be a case of « waking it up », using electricity draws (lights, etc.)
IMO, too much “I know a mate who has done this” on the internet for what has the potential to blow up in your face. Pretty sure the SP2 will be a lithium iron phosphate unit with a BMS which is probably the least likely to fail catastrophically. I have been advised not to “jump” a LiPo but it has been claimed, a LiPo can be encouraged to wake up after the BMS has turned it off by a brief jump from a 12V lead acid chemistry battery. If it were me, I’d buy new and take the hit. Andy
agree, and depending how old the flat battery is, you can possibly save it at your leisure - i can't remember the details but remember that there is a "kickstart" procedure described on here somewhere. @chrisw will shed more light i would think.
Lithium batteries frighten me. If you are going to do this, then do it in the open. The issue is the internal Battery Monitoring System (BMS). The BMS needs some voltage to function. Fully discharged lithium battery = no BMS = no ability to charge. Watch this video. A fully charged lead acid battery, some jump leads and a suitable battery charger should get things charging.
This subject has been discussed a number of times on the forum, including the safety aspects, as a search will no doubt show. The links below might provide additional information: https://www.ducatiforum.co.uk/threads/lithium-battery.102924/ https://www.ducatiforum.co.uk/threads/battery-replacement-suggestions.62276/ . Hope it helps. Tom.
I’ve just got back from the annual training course and we did a module on batteries, part of which covered charging and recovery. We were told that a lithium that falls below 8v is basically scrap. You’ve basically got a failed or shorted cell scenario. Recharging them, by whatever means, can be dangerous, but that rarely stops us having a go I have in the past recovered them using the jump start, but they rarely last or perform that well. If in doubt, bin it and replace. The consequences of failure are far worse than a lead acid type.
