LTWOO ER9 & ERX - Electronic groepsets

[TidyDinosaur]

And have you tried switching batteries between the 2 groupsets to make sure it really isn't a bad battery?

[Finkster]

Is something waking your er9 from time to time?

Also check if the battery was fully charged in the first place. On some power banks the charging may stop but the batteries may not be at 100%. Always visually confirm the battery percentage in the app before unplugging the charger.

Its actually on my trainer bike so its rock steady and not moving at all.  Initially I used a power bank, but switched to a wall socket to ensure.  Yep, I confirmed the batt was full via the app.  But it just steadily depletes even when not in use.  During a 1hour zwift ride, it drops maybe 2 to 3% so its definitely not a huge drain when the derailleurs are shifted.  Another strange thing is I always have to press the RD button in order to connect to the app, even though I had just shaken the RD to wake it up 3 secs ago and the green light blinks to indicate it is awake.  My other ER9 set doesn't need the button press, just the shake to wake.  So I thought something is wonky...

[Finkster]

And have you tried switching batteries between the 2 groupsets to make sure it really isn't a bad battery?

Yep, I initially used sofirn 900mah batts, then when I discovered the batt drain issue, switched to vapcell F12's with a higher mah, thinking my sofirn's had a problem.  Same batt drain issue with the vapcells.  I put the sofirn's in the other ER9 set and no batt drain issue.

Possibly users that report short batt lifespans may have this phantom batt drain issue like I'm having.

[Serge_K]

Would be worth testing the voltage of the cells, but lithium really doesnt like staying fully charged (which is also why it's bad practice to charge phones to 100%), so assuming the group charges the cells to full voltage, that voltage is going to drop a bit to a level the cell is happier with. So for simplicity i wouldn't read much into what happens between 100 and 95, if not 100 and 90. Now if the group drains itself from 90 down to 50 for no apparent reason, then either there's a strange ghost load, or the batteries are trash. Or both.

[Tijoe]

Would be worth testing the voltage of the cells, but lithium really doesnt like staying fully charged (which is also why it's bad practice to charge phones to 100%),

Propagated myth from 10 to 15 years ago that it is bad to charge cell phone batteries to 100%.    Guess what!  Cell phone manufacturers know that it is not good to charge a Lithium battery to a real 100%. What you see displayed at 100% isn't really a fully charged battery. the charging circuits compensate and stop charging before the battery is fully/overcharged, leading to a shorter battery life.

This being stated,  does anyone know if LTWOO is using a charging circuit that wont allow the batteries to be charge limited?  One would think that they would, but the only way to know would be to ask them.

[Serge_K]

It's not a myth, there's ample data from the likes of accubattery that shows the battery degrades less if you dont charge to 100%, AND a lithium cell that gets charged to 4.2V will be much happier at 4.1 or 4V; it doesn't stay at full charge, and it shouldn't be stored at full charge.

[00Garza]

Did anyone have to contact 80's Designer store for a warranty issue? I messaged the store but didn't get any reply regarding a batt problem.

My ER9 (bought Nov 2023) seems to have a battery drain issue which depletes the batts about 10% everyday without any riding.  Batts are new Vapcell F12 and all firmware updated.  Compared to another ER9 set that I got in Feb 2024 which drains maybe 1% per day which probably seems to be the norm.

Anybody have a similar experience?

I had a to get my shifter on my GR9 group replaced. 80 Designer store sent me another and I paid shipping. They had the typical timezone delay on responses.

[reckonair]

I have a canyon endurace cf7 with 105.. Reckon the battery will fit in the seatpost? Also - can I do away with the calipers and retain the 105 brake setup?

[kbernstein]

I have a canyon endurace cf7 with 105.. Reckon the battery will fit in the seatpost? Also - can I do away with the calipers and retain the 105 brake setup?

Yes and yes. But buying the shifters and derailleurs without the caliper makes little sense/might be more expensive than buying the whole thing. Also if you have R7000 the brake calipers are pure trash in my experience. R7100 was a giant upgrade

[reckonair]

Yes and yes. But buying the shifters and derailleurs without the caliper makes little sense/might be more expensive than buying the whole thing. Also if you have R7000 the brake calipers are pure trash in my experience. R7100 was a giant upgrade

Yeah I’d buy the whole kit and keep the unused bits as spare - although I do have the R7000 so I might check out the new calipers.

[Tijoe]

It's not a myth, there's ample data from the likes of accubattery that shows the battery degrades less if you dont charge to 100%, AND a lithium cell that gets charged to 4.2V will be much happier at 4.1 or 4V; it doesn't stay at full charge, and it shouldn't be stored at full charge.

Remember, I am talking about modern cell phones being manufactured by the major manufacturers.   Apple, Samsung,...   What you are saying is true for most other appliances that use Lithium batteries, unless they are installing good charging control circuitry. 
(Look up Samsung Battery Protect.  Samsung charges all of its cell batteries to 85% of full charge, but the phone tells you it is charged to 100%)

https://www.wired.com/story/how-to-improve-battery-life-tips-myths-smartphones/

[toxin]

Actually that is am option in samsung settings and it just stops charging at 85%, still shows 85%.

[jonathanf2]

I have a canyon endurace cf7 with 105.. Reckon the battery will fit in the seatpost? Also - can I do away with the calipers and retain the 105 brake setup?

It should work fine. My mechanical Ultegra bike is setup with LTwoo R9 calipers. Though there was some pad spacing issues which required me to pump the calipers without the brake pads to get them closer to the rotor. Though I prefer this method of adjusting brakes compared to the tight tolerances of my GRX calipers which required me to sand the brake pads slightly.

[jonathanf2]

I'm starting to find that I really don't like the LTwoo shaped hood. Today I went riding and was getting slight hand numbing. They're too slim compared to the beefier grips on my GRX and Ultegra R8020 equipped bikes which don't give me any issues. Even the Sensah Team Pro shifters I was previously using had thicker hoods. My Ultegra bike has the same drop bars and shifter positioning as well. I'm thinking of trying a -17° degree stem to slightly change the angle of my grip positioning. Any suggestions?

[zerstorer]

I am finding it abit thin too. Just do an extra wrap around the hoods with bar tape and it helps. Or put some Eva foam on the hoods before u wrap.

-17 stem would likely make it worse?