LTWOO ER9 & ERX - Electronic groepsets

[rockerplates.de]

ER9 is great if you have a backup bike and a few spare replacement parts. At this point it's more for the DIY crowd. When it works it's awesome. One of my ER9 RDs was totally dead and I had to hard reset it like 30 times until it woke up. Though the EGR sounds like it's been quite solid with less problems.

I think many of us are sadists for using sketchy bike components! 

Well, regarding wheeltop, hambini is just building a bike with it :-/ we will see what finally thinks about the product and we will see if he will destroy it on youtube or like it?

We are still waiting on valid iformation regarding the battery packs they use, it needs certificates and tests if you want to import it to the eu....so far, they only provide ce certs for the charger 24 month old...and ignore my questions regarding the battery...no ul tests etc...

[Sebastian]

Update on my battery drain issues: I had a bit of back and forth with 80 Designer Store. They said they were going to discuss my problem “with the engineer”. The draining issues continued regardless of new batteries. They warned me to not exceed the battery capacity of 800mAh because “the product might die” if I do. I don’t quite understand why? More capacity doesn’t mean higher voltages and/or currents, right? The battery charge will just last longer?

Anyway, I ordered yet another set of batteries exactly to their specs and a charger/testing device to make sure that all my batteries are fine. Even though I’m quite sure there was never anything wrong with my original batteries in the first place.

[Serge_K]

They warned me to not exceed the battery capacity of 800mAh because “the product might die” if I do. I don’t quite understand why? More capacity doesn’t mean higher voltages and/or currents, right? The battery charge will just last longer?

I agree, I see no reason why additional capacity would fry anything. Voltage stays in the right range for longer with larger capacity, but voltage doesn't go higher than a charged lower capacity cell. And i assume the app reads a voltage and returns a value out of 100 for battery life, because no electronics can run a capacity test without running a capacity test, which means charging and discharging and fully chargi the cell, which takes energy, a fan, and hours.

[rockerplates.de]

Update on my battery drain issues: I had a bit of back and forth with 80 Designer Store. They said they were going to discuss my problem “with the engineer”. The draining issues continued regardless of new batteries. They warned me to not exceed the battery capacity of 800mAh because “the product might die” if I do. I don’t quite understand why? More capacity doesn’t mean higher voltages and/or currents, right? The battery charge will just last longer?

Anyway, I ordered yet another set of batteries exactly to their specs and a charger/testing device to make sure that all my batteries are fine. Even though I’m quite sure there was never anything wrong with my original batteries in the first place.

totally bs in case of a draining battery....there may be some "defectice/cold" solderspots, which have more internal resistance and keep drawing energy, there may be moisture somewhere?
the increasing capacity does have effect on hihger "amps" if the c rate is the same...800mah with a c-rate of 10 means 8 amps continues on a stable voltage, 1200 mAh with c-rate of 10 is 12 Amps with a stable voltage supplied....so if your setup ask for 12 amps, the smaller batteries will show a lower voltage....therefore, if there is something wrong with the pcb or rd or ? higher amps may destroy something. This should not happen if properly tested by the "engineers"...

and yes, the charge will take longer..

[Sebastian]

I rode the bike the other day and I noticed that the battery draining apparently only happens when the groupset goes to sleep. I charged it up for roughly 2h. The battery was at 84%. I rode for 2.5h and it was at 82% after. Then I put the bike away. Next morning the battery is at 9%. I doesn’t go lower bc the new lithium cells have an internal PCB that protects them from overcharging/overdischarging. So basically the batteries are empty after one night. I cleaned all contacts again to see if there are any shorts that might have caused this. Didnt help.

No answer yet from 80 Designer Store.

[mozart]

I've had it when I had bike with a cover. because it was working out of the air. try to have it on the front big disk and big rear so that the chain is tight.

[Sebastian]

I've had it when I had bike with a cover. because it was working out of the air. try to have it on the front big disk and big rear so that the chain is tight.

Not entirely sure what you mean. But I store my bike indoors. The sleep mode works very reliably. So usually after just 20-30s the derailleurs will not react anymore when I push the buttons on the shifters. So I’m quite sure that when I store the bike, the groupset is definitely switched off.

[jonathanf2]

I'd try resetting the RD multiple times and see if that triggers the latest firmware update. I'd also try disconnecting the battery cables overnight and then check the charge status. Either you need a new RD or a new battery holder.

[Sebastian]

I'd try resetting the RD multiple times and see if that triggers the latest firmware update. I'd also try disconnecting the battery cables overnight and then check the charge status. Either you need a new RD or a new battery holder.

I've disconnected the RD cable several times already. Then the draining stops and the battery level remains constant. In fact it's how I store the bike now so the batteries keep their charge. I narrowed down so far that it only happens a) in sleep mode and b) when the RD is connected. I haven't tried resetting the groupset. I'll check that out. Can you quickly describe the procedure? Is it just a matter of keeping the RD button pressed until it's reset?

[jonathanf2]

I've disconnected the RD cable several times already. Then the draining stops and the battery level remains constant. In fact it's how I store the bike now so the batteries keep their charge. I narrowed down so far that it only happens a) in sleep mode and b) when the RD is connected. I haven't tried resetting the groupset. I'll check that out. Can you quickly describe the procedure? Is it just a matter of keeping the RD button pressed until it's reset?

I repeatedly pressed and held the RD button several times over and I did a factory reset (write down your fine tuning settings). The app then prompted me to updated my RD firmware to the latest version. Though this may or may not work, because my other ER9 bike groupset hasn't received the firmware update, but I have no issues with that unit.

[Avalius]

Anyone ever had ghost shifts with this group? Group is still going strong here but sometimes very rare it shifts without me touching a shifter. It's so rare that I don't even bother it

[Serge_K]

Anyone ever had ghost shifts with this group? Group is still going strong here but sometimes very rare it shifts without me touching a shifter. It's so rare that I don't even bother it

Until i installed fancy batteries, i would fairly often get multiple shifts (RD) when clicking only once. That 100% disappeared after the battery swap. But i never ever had a ghost shift.

[Sebastian]

I'd try resetting the RD multiple times and see if that triggers the latest firmware update. I'd also try disconnecting the battery cables overnight and then check the charge status. Either you need a new RD or a new battery holder.

I reset the RD three times. I charged it back up. Charging took noticeably longer after that like it used to when the RD was still working normally. But it didn’t help. Battery level dropped to 73% in 12h. Also it didn’t prompt any firmware update. Neither for the RD not for the FD. I got another set of batteries I’m gonna try. Meanwhile I confirmed that my original batteries are working fine. They charge up and my battery tester gives them the thumbs up. They don’t reach 800mAh though. But neither do the brand new batteries I just unboxed. According to spec they should have 800mAh. But my charger gives a reading of 596mAh when they’re full.

Anyway. I’ll do a third run with the third set of batteries. But I don’t expect a different outcome. Meanwhile still no word from 80 Designer Store. I’ll send them my testing results when I’m done.

[Mattpl]

Hi, have somebody EGR shiffters and could test if they work with RD from er9/erx?

[SillyMochi]

What is currently considered a "good price" for the er9 set?