LTWOO ER9 & ERX - Electronic groepsets

[aramus1979]

Shimano clamps work with the er9/erx set

[gloscherrybomb]

My e-gr battery is dropping about 10% per day without being ridden. I have put new batteries in but getting the same. Anyone else?

I have a replacement RD on the way for a different issue, so hoping that resolves it.

[amacal1]

My e-gr battery is dropping about 10% per day without being ridden. I have put new batteries in but getting the same. Anyone else?

I have a replacement RD on the way for a different issue, so hoping that resolves it.

I have an eGR. I went about a week without riding it and, when I checked it, I was at 93%. I don't know what it was charged to before that time, but it couldn't have dropped as much as you say per day. I haven't ridden it in almost a week since then, so I'll go check again and see where I'm at later today.

[Pedaldancer]

Pedaldancer on the forum has been gutting two broken er9 derailleurs, for posterity. Reach out.

And I am still missing taking the microcope photos for you with the attached camera.  .. next week I must finish that task.
The PCB is multilayer style, i didn't count the layers but the layers were very good visible on the cutting edges... don't know how one can figure out the electronic layout.. besides the part which is visible on outer layer - there will be some inner routing for sure.

[mrpercussive]

so I've been pretty lucky on my er9 groupset as it's been working pretty flawlessly aside from that sticking shifter button that has since been fixed. But now for some reason, something is draining it's battery? Like it's not holding charge for too long? I just swapped the batteries too and seems like it's doing the same thing. Anyone had experience this?

[jonathanf2]

so I've been pretty lucky on my er9 groupset as it's been working pretty flawlessly aside from that sticking shifter button that has since been fixed. But now for some reason, something is draining it's battery? Like it's not holding charge for too long? I just swapped the batteries too and seems like it's doing the same thing. Anyone had experience this?

I found you might have to place the charging cable several times on the RD, before it will charge properly. Even if it gives the solid green light, leave the cable on 30 minutes longer. At least with my batteries, it's not giving me an accurate read. What might appear to be battery drain, might actually be under charged batteries.

I'm running 2 ER9 bikes right now, so it's been a good way to monitor any strange quirks between them.

[Sebastian]

Same here. The magnetic charging plug needs solid contact with both the pin in the middle and the metal surface on the RD’s charging port. Otherwise it will drain the battery instead of charging it. The green light will flash regardless so you need to check the battery level. I just clean the RD charging port every time I have to charge. It hasn’t happened anymore since I’m making sure it’s clean.

[mrpercussive]

I found you might have to place the charging cable several times on the RD, before it will charge properly. Even if it gives the solid green light, leave the cable on 30 minutes longer. At least with my batteries, it's not giving me an accurate read. What might appear to be battery drain, might actually be under charged batteries.

I'm running 2 ER9 bikes right now, so it's been a good way to monitor any strange quirks between them.

Same here. The magnetic charging plug needs solid contact with both the pin in the middle and the metal surface on the RD’s charging port. Otherwise it will drain the battery instead of charging it. The green light will flash regardless so you need to check the battery level. I just clean the RD charging port every time I have to charge. It hasn’t happened anymore since I’m making sure it’s clean.

Mine gets to full charge as I check it after with the app and on my igpsport but then the power drains real quick. Like it will die overnight. It did happen after i was caught in a torrential storm though. Did not have any issues before that. Possible some things may have gotten wet and shorted out?

[mrpercussive]

So update on my battery issue. I have reached out to 80 Designer Store and responses have been pretty darn quick despite the timezone differences and also being a weekend. They responded with sending me a quick troubleshooting chart but i had already ruled out those things. Next response is that they're gonna "Discuss with engineer" (that's a direct quote) and get back to me next week.

[Sebastian]

Did you check the plug connections on the FD and RD to make sure there’s no water residue in there? That could cause some sort of short circuit.

[mrpercussive]

Did you check the plug connections on the FD and RD to make sure there’s no water residue in there? That could cause some sort of short circuit.

Yup! Dry... so hopefully it gets warrantied somehow or it fixes itself somehow... Pretty bummed. Really wanted this to work and it has been for almost a year and then this...

[jonathanf2]

Yup! Dry... so hopefully it gets warrantied somehow or it fixes itself somehow... Pretty bummed. Really wanted this to work and it has been for almost a year and then this...

Did you do any preventative measure with the cables like dielectric grease or heat shrink plastic? I've yet to ride any of my ER9 bikes in wet weather and I don't plan to! 

[mrpercussive]

Did you do any preventative measure with the cables like dielectric grease or heat shrink plastic? I've yet to ride any of my ER9 bikes in wet weather and I don't plan to! 

no i didnt... just installed and rode it. I don't plan to ride in rain either and when it's shit weather i'm normally just stay indoors or grab my gravel bike as i hate cleaning bikes. Coming from California, it's been pretty easy to figure out but now that i'm in Virginia, it rains all the time and sometimes from out of nowhere like what happened to me and it sucks... so yea hopefully it gets figured out soon

[jonathanf2]

no i didnt... just installed and rode it. I don't plan to ride in rain either and when it's shit weather i'm normally just stay indoors or grab my gravel bike as i hate cleaning bikes. Coming from California, it's been pretty easy to figure out but now that i'm in Virginia, it rains all the time and sometimes from out of nowhere like what happened to me and it sucks... so yea hopefully it gets figured out soon

If there is an issue, I'm sure it's RD related. I would thoroughly dry the RD with a blow dryer or something and clean both the battery and charging ports. Maybe even let it sit for a few days.

If nothing works, hopefully the 80 Design store sends you a replacement RD. Since I bought one of my ER9's from them, I'd be curious how they handle customer service! I'm in SoCal and that was one of the reasons I took a chance with the groupset since I know most my weather will be dry. So far it's been flawless, but I still wouldn't chance it in the rain.

[Phaxe]

If there is an issue, I'm sure it's RD related. I would thoroughly dry the RD with a blow dryer or something and clean both the battery and charging ports. Maybe even let it sit for a few days.

If nothing works, hopefully the 80 Design store sends you a replacement RD. Since I bought one of my ER9's from them, I'd be curious how they handle customer service! I'm in SoCal and that was one of the reasons I took a chance with the groupset since I know most my weather will be dry. So far it's been flawless, but I still wouldn't chance it in the rain.

I ended up using liquid electrical tape around the connector as a preventative measure. When I was on my road bike today, which has ultegra di2, I realised that I've done 45,000km on it without a single hiccup. I guess that's why you'd spend the extra money it.