Bypass Battery from Charging System: Motogadget/Lithium Battery

Raygun57

New Member
Hi All,

I'm in the process of building my CB550 wiring loom for a cafe racer build (photo below for attention!). I'm running a modern reg/rec with a higher output voltage than required for the Lithium battery, which I understand could damage it. I'm also using a Motogadget system.

Is there a way that the stator can provide power to the bike's systems (headlights, gauges, etc) but bypass the battery so it doesn't charge? i.e- the battery is only used to start the bike and run the ignition pre-start up. I've heard this referred to as a 'dead loss' system? The bike will live on a trickle charger, and I have a kickstart as a backup- so I'm not too worried about it discharging during rides.

As far as I can tell there is no way to do so as they will all be connected via the starter solenoid and integrated main fuse- that feeds the motogadget?

In terms of technical detail I'm running a Shorai LFX14A2-BS12 Battery ( 14ah Pb Eq, 210CCA, LiFePO4 compostion) with a max recommended charge voltage of 14.8v. My Reg Rec is from DavidSilverSpares and is from Century Ignition parts, with an aprox output voltage of 15V, tested ranges between 14.7 and 15.1v

Other solutions would be welcome, but I'm loathe to spend more on another brand new reg/rec!

Raygun

20210811_220735.jpg 20210811_220743.jpg
 

irk miller

You've been mostly-dead all day.
DTT BOTM WINNER
Are you sure you have a reg/rec that has an output voltage above 15.2V? If so, I would buy another one instead of trying to run it as total loss. If you drain that LiFePO4 battery, it will kill it. You're running at a much higher risk of killing the battery at total loss.
 

Sonreir

Oregon
DTT SUPPORTER
Yes, it's possible to do this, but as previously mentioned, it's better to just get a compatible R/R.

If you really do want to go through the trouble of separating the battery from the rest of the system, let me know and I can provide guidance.
 

CarbsAndCylinders

Careful With That Axe Eugene
Yes, it's possible to do this, but as previously mentioned, it's better to just get a compatible R/R.

If you really do want to go through the trouble of separating the battery from the rest of the system, let me know and I can provide guidance.
Would this apply to any bike ( I would not think so but I hope so)? Do all alternators have the capacity to put out more than 15.v and are only limited by the R/R? I was told that my Suzuki GT500 could not sustain a lithium battery, but would a change in R/R fix this?
 

irk miller

You've been mostly-dead all day.
DTT BOTM WINNER
A 280 watt alternator like in a GT750 or GT500 is only producing 14 - 15 volts, then it's regulated to 13.2 volts.
 

gt alex

Been Around the Block
I had a sv650 gen R/R die and blow up my lithium battery. I replaced the battery and the R/R charge voltages etc. were correct but the battery was losing charge if sat for a couple of days perfect while running, so I adapted a gsxr600 R/R now all is good max v14.5 and the battery holds charge when sitting.
Basically saying try another R/R. That's my suggestion it's not worth over charging the battery.
 

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