I own a 2015 Quintana Roo PR6 with an Ultegra Di2.
I purchased the bike in early 2017.
Before I started my outdoor TT bike season last weekend, I charged the battery I assume I fully charged it, as it was at least 3h on the charger and the orange light was not on anymore.
Didn’t check the status of the battery though before I took the charger off.
Today on my bikeride, the battery was empty, after a total of 200km since the charging.
Has anyone experience on the overall lifetime of a Di2 Battery?
In the 5 years, I might had to charge the battery between 5 to 10 times max, the bike was new when I purchased it (assuming the battery as well).
Could it be, that it’s the end of the battery’s life time?
Any idea how to find out besides hopping on the bike and see if it lasts longer this time?
The other option is if you left it at either end of the rear cassette and the motor is pushing against the limit screw all the time - this can drain the batteries really fast.
The other option is if you left it at either end of the rear cassette and the motor is pushing against the limit screw all the time - this can drain the batteries really fast.
It can happen mid-cassette too. My son shifted mine when the bike was in the floor stand, I didn’t think much of it, but it was drained the next day.
I have a 2014 Speed Concept with Ultegra DI2 as well. I just had the battery replaced as it wasn’t holding a charge. Sounds like yours is just end of life like mine was.
A rapid draining of a DI2 battery can be caused by a faulty junction box. Since moving to 11sp DI2 with the E-tube wiring I’ve had two A junctions go bad and drain batteries in no time. If you have another, swap it out and see how your battery does. Of course, your battery could be bad and need replacing too.
Do you have a garmin head unit? I have a P5D from 2019 and I just started getting that after my 830 updated. I am still figuring it out but I think it’s the garmin. I reinstalled firmware on the Di2 battery and it did not fix issue. I rode the tt bike for 1/2 hr today and it started flashing dead battery on the head unit but it was still shifting. I then stopped when I got home and it would not shift. I could not get the bike to show on the shimano app. I had to plug in the charger and then press the button on the junction box to get it to pair with my Shimano app. I only plugged in the battery for 30 seconds and unplugged it. It then said battery was 100% full. It shifted fine after that. Garmin said 100% too. I am going to delete the sensor connection on the garmin and see if the battery then runs fine. I will probably ride with a battery backup just in case. Hoping I don’t need to buy a new battery or a junction box. I have the round junction box that fits in the stem.
If the batteries are allowed to remain for long periods below half charge, and especially below 20-25% charge, I believe that shortens the overall life of the battery. I have a battery about the same age. My routine charging protocol for first 2 yrs ownership was “charge when dead.” That means it spent months hanging out at very low charge. That battery now requires charging every couple weeks or so.
I have another newer one on a different bike which I have charged more regularly and it shows no loss of life.
I do Have a Garmin Head but without a BT connection to the di2 infrastructure, I can‘t see it having an effect on the batterie. As there is no Dfly unit & BT connection, I‘d rule that out.
I do Have a Garmin Head but without a BT connection to the di2 infrastructure, I can‘t see it having an effect on the batterie. As there is no Dfly unit & BT connection, I‘d rule that out.
The Garmin firmware update was not the problem. Battery and junction box were good too. It was a bad Di2 internal wire that was cutting out. It must have also been creating a bad signal to the Garmin.
Have you since tried charging again to see if it will accept a charge and work?
When rechargeable batteries fail, they typically just hold much less charge, but they function for a time. It is less common that they fail suddenly and completely. In your case, it was working before putting it on the charger. Then it stopped working sometime during the charging. So a few things… Maybe the Junction A died while charging and took down the system. Maybe the battery died while charging.
I cannot think of an easy way to confirm which might have occurred. My bet is on the battery, though. It seems more likely that the battery would fail than the Junction A.
One other dark horse is that your charger failed and took the bike down with it. Maybe you got a power surge or something that burned you.
yes, charged immediately on Saturday. today, light still illuminates green for 2 sec, so no charge lost I’d say.
probably will ride the bike on the weekend, then see how much charge is gone.
still have 2 month to figure it out until challenge roth
It may be just a one-off fluke. Monitor it, but maybe you will never see that again.
I once had a full discharge of one of the shifter coin cell batteries in my eTap. I figured out a while later than I had stored the bike something touching the shifter and that fast-drained it. You might have done something similar: something touching a shifter or the RD shift motor trying to complete a shift.
