Motorino led acid to LiFeP04 upgrade issues

[eddieme]

Hello all. I have an older XPh Motorino. There has always been led acid barrteries in it. I recently put some LiFeP04 in it. With these new ones, I turn the breaker and key on, it chiprs and the display flashes then the bike completly turns off. Is there another modification that is needed to avoid this issue? It is very frustrating.

 

[Dui ni shuo de dui]

Hello all. I have an older XPh Motorino. There has always been led acid barrteries in it. I recently put some LiFeP04 in it. With these new ones, I turn the breaker and key on, it chiprs and the display flashes then the bike completly turns off. Is there another modification that is needed to avoid this issue? It is very frustrating.

It is difficult to answer with so little information.
What voltage were you running with your SLA batteries?
What voltage are you running now with the new ones?
Are you sure these new batteries can be put in series like this? Each battery probably has its own BMS (battery monitoring system) and as far as I know it is possible to parallel the BMSs but not necessarily possible to put them in series unless they were specifically designed for this purpose.
In my opinion that might be the issue. You need to contact whoever sold you the batteries and check with them if they can be wired like this.
Some lithium batteries can, but some can't.

 

[eddieme]

Thanks for the reply. I did check with the battery manufacturer and they can be run in series. The SLA batteries were outputting about 52V. The lithium are as well. According to the manufacturer, they can be in series up to 4 batteries.

 

[Dui ni shuo de dui]

Ok, well at least that's good news if the manufacturer says they can be put in series.
What puzzles me is that looking at your video it seems to behave just like it is a battery BMS cut.

It might be just that, because when you turn the key then current starts flowing towards the controller capacitors at a high rate, which the BMS might see as too much current and then it cuts to protect the battery. That seems rather weird because it shouldn't be that much current. But maybe these batteries are intended for solar systems, and so maybe they aren't designed for high current outputs.

Again, you provide very little information so if you really want some help I suggest you give a lot more data.
We have no idea what these batteries are, if there was a datasheet or some link to the manufacturer website that would be nice.
Also more pictures of how they are wired in the bike wouldn't be such a bad thing.

Are they all individually fully charged?
Dit you check that every connection is tight? Check again and tighten every screw one more time just to be sure, especially the ones at the breaker.
What does the seller tell you?
Did you try to switch it on with the charger connected?