If that's the case then I guess I'll have to make a warranty claim now after the racing season is over. Last time I checked my older battery had the capacity of 78% after 70+ cycles and the newer battery had 88% after 20+ cycles. The range have been getting noticeable lower when riding with the older battery.I thought that the warranty was for 80% at 500 cycles or 60% at 1000, so would expect them to honour your claim based on the above?
I go biking with a friend of mine and he rides a Ghost with 375 wh (8000, health 99%), when we finish our rides ups and downs of 30 kms or so I do not have any spare miles to go. This 20% loss is apparent. I checked back with some other dealers and both said my battery must be faulty and do not understand why Shimano is arguing with me.I thought that the warranty was for 80% at 500 cycles or 60% at 1000, so would expect them to honour your claim based on the above?
Out of interest, have you actualy noticed a drop in capacity?
Based on this thread, I would guess they are keen to not have a significant number of batteries needing replacement. Whether it's a software or real issue, the result for them is the same, and batteries are not a cheap thing to replace.I go biking with a friend of mine and he rides a Ghost with 375 wh (8000, health 99%), when we finish our rides ups and downs of 30 kms or so I do not have any spare miles to go. This 20% loss is apparent. I checked back with some other dealers and both said my battery must be faulty and do not understand why Shimano is arguing with me.
You may have a laugh, guess what Shimano said to me: go biking another 2000 km and if you loose another 20% we will replace it! )) Perfect customer treatment in white gloves I won't let it go like this.Based on this thread, I would guess they are keen to not have a significant number of batteries needing replacement. Whether it's a software or real issue, the result for them is the same, and batteries are not a cheap thing to replace.
Not the best customer service!You may have a laugh, guess what Shimano said to me: go biking another 2000 km and if you loose another 20% we will replace it! )) Perfect customer treatment in white gloves I won't let it go like this.
This is what I did, Merida, Czech Republic and they only contacted Shimano, Czech Republic, no diagnostics, your battery is fine. I am taking my bike today to another dealer who will run Shimano diagnostics. They can also run a performance test. Will see what comes up tomorrow, will keep you posted.Not the best customer service!
Ive just tried to find the official line on the warranty, and I'm sure they have changed it. On the UK FAQs, it only mentions 1000cycles, and on the US equivelant nothing abiut cycles, only that is will degrade ~5% per year.
You could try taking it back to where you purchased it from and saying it's not fit for purpose?
Hi Milan. How have you done 2200km on only 46 charging cycles? And, do you ever fully charge the battery?Hi all,
just filed a warranty claim with Shimano.
1) # of charging cycles 46
2) remaining capacity 81%
3) E6002 charger
4) Battery BT-E8035 504wh
5) 2190 km
Basically, I currently loose 1% of battery capacity on every 100 km. A Shimano tech said it was ok and closed the claim. I will reopen this claim next week as all my friends run the same shimano 7000 or 8000 and their battery health is 97 to 99% with more or less the same mileage. After reading all comments here and contacting all sorts of dealers, I am more than certain that there is something fishy about BT-E8035 504 wh!!! It is simple: some pieces are fine, some are not. Whatever the charger or conditions. I wish I was the lucky one to win the right piece if I ever get to win this battle! My customer expectation is that I should be now having a battery with the health of 98% to min. 93%. This would also be in line with what Shimano claims and advertizes.
The previous owner charged it as he pleased (as told by Shimano), i.e. charge it anytime you can, since you need to ride soon again (34 cycles). The remaining 12 cycles are mine which mounts to around 650 km. Those were charged from the last bar to five full + LED light on the charger off (as I was told again that's the only time when it is fully complete and finished). Two cycles of those 12 were a complete discharge and a complete charge as I was told this would remedy the battery health....as somebody already noted in this thread. On Saturday we are going to test same 504 shimano batteries. His saying healthy, mine saying unhealthy Let's see how far we can get and whether this is just a software bug....Hi Milan. How have you done 2200km on only 46 charging cycles? And, do you ever fully charge the battery?
The previous owner charged it as he pleased (as told by Shimano), i.e. charge it anytime you can, since you need to ride soon again (34 cycles). The remaining 12 cycles are mine which mounts to around 650 km. Those were charged from the last bar to five full + LED light on the charger off (as I was told again that's the only time when it is fully complete and finished). Two cycles of those 12 were a complete discharge and a complete charge as I was told this would remedy the battery health....as somebody already noted in this thread. On Saturday we are going to test same 504 shimano batteries. His saying healthy, mine saying unhealthy Let's see how far we can get and whether this is just a software bug....
Yes, that makes sense. I should have done some quick math - 46 charges for 2200km sounds phenomenal, but it isn't. It sounds as though you have a routine for charging, supposedly our batteries are happiest between 30 and 60%. This is just something to consider. I charge as needed. Most of the time for me, a 20km steep ride on eco leaves me close to that first bar transition (20%) from 60%. The occasional ride I do with a friend in trail mode I charge more; and a full balance charge once a month or so. I charge back up to 60% after a ride. The beauty of this is, if I don't get another ride in for a few days, the battery is sitting at a comfortable charge for storage.The previous owner charged it as he pleased (as told by Shimano), i.e. charge it anytime you can, since you need to ride soon again (34 cycles). The remaining 12 cycles are mine which mounts to around 650 km. Those were charged from the last bar to five full + LED light on the charger off (as I was told again that's the only time when it is fully complete and finished). Two cycles of those 12 were a complete discharge and a complete charge as I was told this would remedy the battery health....as somebody already noted in this thread. On Saturday we are going to test same 504 shimano batteries. His saying healthy, mine saying unhealthy Let's see how far we can get and whether this is just a software bug....
Just posted the outcome.....Interested to see the outcome of this test
You are definately right, it would be nice to nail that issue down. It may as well be purely related to certain models of batteries. Mine has got no letters either: BT-E8035 and its health is 80% only one year old.I believe that the bad battery health is related to the battery "version", which is the letter at the end of the battery type.
My battery is two years old and its health is 98% and it has no version letter, I mean, it is BT-E8010. But I know that newer batteries are revisions B and C, ie, BT-E8010C.
I suggest we complement the battery data that we have provided by adding the battery version letter. And may be we can relate the bad battery health to one of the versions, that may have cells from a different supplier that are more prone to fail.
You are definately right, it would be nice to nail that issue down. It may as well be purely related to certain models of batteries. Mine has got no letters either: BT-E8035 and its health is 80% only one year old.
Just turned 50 cycles.May I ask how many charge cycles do you have on it?
Update
1) # of charging cycles 23
2) remaining capacity 99%
3) I use E6000 charger exclusively
4) Battery BT-E8010 504wh
6) 14 months old / ~1500 km
BT e-8010 #1
18 months old - 1,342km - 29 cycles
99%
BC e-6000 charger
Always charged to 50% on return from ride, stored in fridge in a sealed bag over summer (so never gets much ambient exposure over 25degC). Only gets charged to 100% immediately before riding (to minimise time in this less than ideal state).
BT e-8010 #2
Brand new (mfg in Singapore Sep 2019) - charged to 100%, once, just out of the box, and then ridden down to 50% charge for storage - so <1 cycle
100% on the Emax app
I learnt from my previous bafang battery that extended high states of charge, particularly over summer with temps >25degC, damage batteries..
I am the Silly Biker Nr.2 who rode with Milan. I think the test was a good comparison of batteries. The assistence level on my Ghost was set exactly to the same values as his. The screenprint was done before setting assistence levels to show battery health. We rode together, using exactly the same modes. When his battery died , I still had 32% left. The range in Eco shown was 41 km ( I do know it is a very rough estimate only) Our weight difference is 29 kg but I think I had cca 4 kg worth of weight in the backpack. So all up 25 kg difference. I do think his battery is not that "healthy" considering how young the battery is. I guess he does get cca 15-20 less range than he should.
You are definitely right that e8035 are defective and poor design. I have just been told that Shimano will agree to warranty as soon as my battery health is 79%. I, however, doubt that they will do this over and over again. This thread clearly shows that e8035 is a defective design. If you read any study on li-on batteries, they are considered 'dead' as soon as they go down below 80%. I have spoken to a number of retailers and they themselves did with some other ones too, so it now counts 5 who say that there is really something wrong with this model. And admitted that those who shout most are those who get a new one I know that this sounds naive but it would be worth going for some collective claim to make this thing clear once and forever with Shimano. Sure, all of that people say here in the thread about how they treat their batteries nice, charge them 80-85% and how healthy they have them, it is all perfect and in line with the best practice, BUT they do not have the e8035.My set of warranty batteries (e8035) are declining in health in the same fashion as my original batteries.
Such a low cycle count and rapid degradation in health is not normal and to me indicates a defective design.
I tried to warranty my previously warrantied batteries and now Shimano is saying they need to be at 60% health or lower to qualify for a replacement.
I am disappointed with Shimano's response given this type of rapid decline falls far outside the norm. I expect my batteries to age, but not this fast. I'm hoping that Shimano acknowledges that its e8035 model batteries are defective.
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Original Battery that came with bike:
90% health; 10 cycles
87% heath; 23 cycles (at 87% Shimano agreed to warranty)
85% health; 32 cycles
84% health; 38 cycles
82% health; 40 cycles (exchanged for new warranty battery, took about two months as back ordered)
Original Battery Purchased from LBS:
90% health; 10 cycles
87% health; 20 cycles (either at 90% or 87% Shimano agreed to warranty)
85% health; 30 cycles (exchanged for new warranty battery, took about two months as back ordered)
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Warranty Battery 1
91% health; 4 cycles and - only 20 days old! (Shimano said they wanted more degradation)
89% health; 11 cycles
87% health; 20 cycles (Shimano refused to warranty said it has to be at 60% health)
Warranty Battery 2
90% health; 11 cycles (Shimano said they wanted more degradation)
90% health; 14 cycles
87% health; 21 cycles (Shimano refused to warranty said it has to be at 60% health)
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