LTWOO ER9 & ERX - Electronic groepsets

[rockerplates.de]

Come on now, have you modeled anything you say? have you calculated the amps that high discharge vape cells that are meant to work for mere minutes crank out vs the current draw of these derailleurs that are meant to work for thousands, thousands, thousands, and many thousands more actuations?

I have built up the distribution for Kokam Lithium polymer cells in Europe (and did a project with their cells for bmw in formula one), over a decade ago, have develope a 350mAh cell which is capable of discharge rates up to 20 c...so i am in the business since it started.
Ltwoo had massive problems with their aftermarket mtb shifting set, which pulls the shiftingcable.., they did not even understand why voltage drops und higher loads and comes back after the shift was done...

I just wanted to help and having a 1000mah battery only being able to work 3 Amps, which is 3 C will probably end up in chaos...especially if its getting colder...internal resistance, you know....

No, i have not measure current draw for this system, as i do not have anymore left, we are happy to have sold those crappy products and i am not willing to do the work for ltwoo...the crappy pcb, which does not securely protect the battery housing from shortening is another sign of their engineering skills.
Vapecells provide currents up to 10 or 15c without showing significant voltage drops...so they wont go bad fast because of cell chemistry being hurt with too high discharge rates..it was just a recommandation to be on the safe side....
There are many discharge curves available here:

https://lygte-info.dk/review/batteries2012/Vapcell%20INR18350%201100mAh%20(Purple)%20UK.html

Basically, feel free to buy or use whatever you want...i will hold back my posts in this thread

[jonathanf2]

I decided to order some new batteries from Nitecore. They do have US warranty service for their batteries and they appear to be well-built. They're a bit more spendy than what you'd find on Ebay, but hopefully this should at least eliminate any potential battery issues with the ER9.

https://nitecorestore.com/collections/batteries?sort_by=best-selling&filter.p.m.battery_info.battery_size=14500

I received the Nitecore batteries only to find out they're about 5mm too long. I should have double checked the specs, but here's me presuming 14500 batteries should all be the same. Might as well designate the battery something else if they're physically bigger.

[jonathanf2]

Woohoo! 80 Design Store replied back and they are sending me a replacement ER9 rear derailleur! It's definitely worth paying a little extra to get customer support from them on products. They've definitely earned my future business.

[Avalius]

Woohoo! 80 Design Store replied back and they are sending me a replacement ER9 rear derailleur! It's definitely worth paying a little extra to get customer support from them on products. They've definitely earned my future business.

Once again they deliver, put your hands up for 80 designer store our lovely supplier 

[Serge_K]

Woohoo! 80 Design Store replied back and they are sending me a replacement ER9 rear derailleur! It's definitely worth paying a little extra to get customer support from them on products. They've definitely earned my future business.

Great news indeed! that's how long after you bought it from them?

[jonathanf2]

Great news indeed! that's how long after you bought it from them?

This unit was purchased in June 2024 and is my 2nd ER9. This RD has been exhibiting a bit of strange behavior since I installed it. I suspect the motion sensor to wake it from sleep is slightly off and possibly has abnormal battery drain. Since I have my 1st ER9 bike as a comparison in performance, I've been able to notice differences.

[mrpercussive]

Woohoo! 80 Design Store replied back and they are sending me a replacement ER9 rear derailleur! It's definitely worth paying a little extra to get customer support from them on products. They've definitely earned my future business.

Hell yeah... I definitely check their store when Im looking for stuff nowadays before going anywhere else!

[Sebastian]

So, after roughly 40.000 shifts of flawless performance, my groupset is finally showing issues: I'm experiencing battery drain. I came home from a vacation trip and the bike was stored on the wall for a week. The RD was dead because the battery was fully drained. I recharged it to 100%, went out on a 90min ride and it was down to 82%. After leaving the bike for another day it's now at 59%.

Has anybody with these kinds of issues found a cause and/or solution? The batteries have given me zero trouble so far. I doubt that that's what's causing the problem. I'm gonna clean the plugs and connectors and weatherproof them and see if that does anything.

[jonathanf2]

So, after roughly 40.000 shifts of flawless performance, my groupset is finally showing issues: I'm experiencing battery drain. I came home from a vacation trip and the bike was stored on the wall for a week. The RD was dead because the battery was fully drained. I recharged it to 100%, went out on a 90min ride and it was down to 82%. After leaving the bike for another day it's now at 59%.

Has anybody with these kinds of issues found a cause and/or solution? The batteries have given me zero trouble so far. I doubt that that's what's causing the problem. I'm gonna clean the plugs and connectors and weatherproof them and see if that does anything.

That's what happened to me. I rode my gravel bike for 2 weeks straight, decided to ride my SPCycle ER9 road bike and it just died. After reseting the RD like 30-40 times in a row while plugged into the charger, it finally woke up. My FD was still working the whole time, it was just the RD that was dead.  Though I had already messaged 80 Design Store and they sent me a replacement RD since I'm not sure what's going on with my current one. Strangely enough LTwoo issued a firmware update on the app for that RD once it woke up!

Get this, between my two ER9 groupsets both RDs and both FDs all have different firmware versions. I can only presume each one has slightly different internal hardware, because you'd think they'd all have the same FW updates applied.

Though my TFSA ER9 road bike has zero issues with battery drain even if I let it sit for awhile. This one has taken the most abuse as well and no issues using the same exact batteries. I can only surmise the issue stems from the RD or battery holder causing drain issues if they pop up.

[Sebastian]

Well, I cleaned all connections and sealed the plug on the RD with silicone grease again.
The battery level went up again to 60% when checking on the app. Whatever that means.

I have a theory that dirty connections on the RD can cause drain issues. I noticed for example that if the magnetic connector on the RD that the charger plug goes onto is dirty, then the charger can actually drain the battery instead of charging it. I dunno if dirt can cause some sort of shorting issues? Anyway, when that happened, I just needed to wipe everything clean and it went back to normal.

Well see what happens, I guess. I'm kinda glad that I bought my groupset at 80 Designer Store as well. So hopefully they'll step in if my RD decides to die.

[mrpercussive]

So, after roughly 40.000 shifts of flawless performance, my groupset is finally showing issues: I'm experiencing battery drain. I came home from a vacation trip and the bike was stored on the wall for a week. The RD was dead because the battery was fully drained. I recharged it to 100%, went out on a 90min ride and it was down to 82%. After leaving the bike for another day it's now at 59%.

Has anybody with these kinds of issues found a cause and/or solution? The batteries have given me zero trouble so far. I doubt that that's what's causing the problem. I'm gonna clean the plugs and connectors and weatherproof them and see if that does anything.

I had the same thing happen to me after being caught in the rain. 80 Designer store sent me a new rear derailleur. While waiting for the new one to get in, the old one did start to hold charge a little better over time but I went and swapped out the derailleurs anyways and everything was running good. No idea how the old one is doing now as its been sitting in a box since all this went down

[Sebastian]

Cleaning everything didn’t do much apparently. The groupset works but the battery went from 60% to 44% over night. So still considerable battery drain.

[Queen of Skulls]

So, after roughly 40.000 shifts of flawless performance, my groupset is finally showing issues: I'm experiencing battery drain. I came home from a vacation trip and the bike was stored on the wall for a week. The RD was dead because the battery was fully drained. I recharged it to 100%, went out on a 90min ride and it was down to 82%. After leaving the bike for another day it's now at 59%.

Has anybody with these kinds of issues found a cause and/or solution? The batteries have given me zero trouble so far. I doubt that that's what's causing the problem. I'm gonna clean the plugs and connectors and weatherproof them and see if that does anything.

 have you tried replacing the batteries...  they can get weak and break down from constant drain... Kinda like phone batteries dont last as long as they used too after a year or more.

[Sebastian]

have you tried replacing the batteries...  they can get weak and break down from constant drain... Kinda like phone batteries dont last as long as they used too after a year or more.

I’ve been using the groupset for something like 8 months and around 5.000 km. I must have charged it less than 20 times throughout that period. So I can’t imagine that the batteries already show that kind of behaviour after just so few charging cycles. Also, the drainage kind of started from one day to the next. It used to hold the charge for a long time. And there was no drainage when the bike was stored and the groupset asleep. So I think there’s another issue going on.

[Sebastian]

I contacted 80 Designer Store. They too suggested that the batteries might be the problem. So I agreed to swap them out and see what happens. I bought a set of 14500 cells with high capacity and discharge voltage, as recommended by rockerplates. Let’s see what happens.