Campagnolo EPS V3 here

Discuss light weight issues concerning road bikes & parts.

Moderator: robbosmans

Seedster
Posts: 656
Joined: Fri Jun 05, 2015 11:05 pm

by Seedster

Picked up my 11s V4 battery today for a hefty sum. On the bright side, I can finish my SB/03 build this weekend.

Image

Image
Image
Image
Image


Sent from my iPhone using Tapatalk

by Weenie


User avatar
Miller
Posts: 2026
Joined: Thu Sep 21, 2006 8:54 pm
Location: Reading, UK

by Miller

Interesting that the box printing calls that EPS v4. So this is a modernised power unit for v3 11 speed systems. Is the battery capacity any different to the original v3 PU?

User avatar
Mockenrue
Posts: 544
Joined: Mon Aug 20, 2012 10:32 am
Location: Brexshitland

by Mockenrue

I wonder why the part number on the box says PU21-11EPS yet the one on the unit itself says PU19-11EPS.

Seedster
Posts: 656
Joined: Fri Jun 05, 2015 11:05 pm

by Seedster

Campy suggested ut would be a longer battery life per charge, but I will compare it with the old dead v3 battery in my seatpost.

Seedster
Posts: 656
Joined: Fri Jun 05, 2015 11:05 pm

by Seedster

It appears to be a more powerful battery based on the greater voltage and watt hours. Pictured below is the outgoing eps 11 v3 at the the top, and eps 11 v4 at the bottom.

Image
Image


Sent from my iPhone using Tapatalk

XCProMD
Posts: 1015
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

That’s what makes EPS so much better than any other electronic groupsets. More voltage, less current.

Unfortunately DA 9250 will still be 7,4 V nominal


Skickat från min iPhone med Tapatalk

User avatar
ultimobici
in the industry
Posts: 3602
Joined: Sun Nov 21, 2004 2:45 pm
Location: London, UK
Contact:

by ultimobici

XCProMD wrote:That’s what makes EPS so much better than any other electronic groupsets. More voltage, less current.

Unfortunately DA 9250 will still be 7,4 V nominal


Skickat från min iPhone med Tapatalk
Having used both EPS & Di2 extensively, I have to ask - why??


Sent from my iPhone using Tapatalk

XCProMD
Posts: 1015
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

It’s possible to elaborate further into this, but as a short answer, higher voltage and less current means for the same torque out of a limited size motor there’s less stress on the battery.

Li-ion batteries can peak at current levels that Ni-Cd or NiMh could only dream of and that’s what made electronic shifting feasible in the first place (as we know it today anyway, Mavic’s ZMS used the torque on the upper pulley to shift), but draining too much current often will fry them.

Then you could shut off the system at a level that’s safe for the battery for years, but if you mr voltage is low, you risk not having enough torque to execute a shift in certain circumstances.

I guess you’re familiar with the usual noise coming from a derailleur in which one of the limit screws is set too tight. That’s the motor trying to execute the shift, drawing current above cut-off levels and, well, being cut off. If I remember correctly a Di2 derailleur will try 2 times, then third one after a while.

If that cut off was set even lower, the system would not manage to execute shifts under torque in big-next to big, for example, or with a dirty transmission. So there’s a compromise there, less so in Campag’s case.


Skickat från min iPhone med Tapatalk

Bobbyc123
Posts: 55
Joined: Mon Oct 19, 2020 10:40 am

by Bobbyc123

Can you please simplify and elaborate a bit more? I don't quite understand what you're alluding to.

Never having owned di2 are you saying di2 owners have shifting issues in the long term due to the battery?

User avatar
Miller
Posts: 2026
Joined: Thu Sep 21, 2006 8:54 pm
Location: Reading, UK

by Miller

I don't think these comparisons are particularly helpful although the info about current is interesting. I have been running EPS for a few years and it's a very solid and reliable system that shrugs off crappy conditions. Campag do warn about your keeping your fingers away from the front mech because it is very forceful when it actuates.

borderlad
Posts: 1
Joined: Fri Jan 16, 2015 11:22 pm

by borderlad

Bobbyc123 wrote:
Sun Feb 21, 2021 3:57 pm
Can you please simplify and elaborate a bit more? I don't quite understand what you're alluding to.

Never having owned di2 are you saying di2 owners have shifting issues in the long term due to the battery?
[/quote
Di2 doesn’t like shitty conditions when the battery is low or near end of life. Shifting either doesn’t happen up the cassette at all or does so intermittently. EPS doesn’t seem to encounter any of these issues. It might be trickier to fit than Di2 but once sorted is incredibly reliable especially in the awful weather we have here in Wales. I have one 18 month old Di2 system and two eps systems a V2 and a V3 which are now getting on a bit and all I’ve done is charge the battery when needed.

neeb
Posts: 796
Joined: Tue Jan 27, 2009 8:19 pm

by neeb

The important question is... will there be any significantly noticeable differences to the older battery in use? 8.33 w/h doesn't seem massively different to 7.77 w/h, but could other aspects of the design mean that time between charging or longevity is better by more than that (approximately) 7%?

Bobbyc123
Posts: 55
Joined: Mon Oct 19, 2020 10:40 am

by Bobbyc123

borderlad wrote:
Sun Feb 21, 2021 5:43 pm
Bobbyc123 wrote:
Sun Feb 21, 2021 3:57 pm
Can you please simplify and elaborate a bit more? I don't quite understand what you're alluding to.

Never having owned di2 are you saying di2 owners have shifting issues in the long term due to the battery?
[/quote
Di2 doesn’t like shitty conditions when the battery is low or near end of life. Shifting either doesn’t happen up the cassette at all or does so intermittently. EPS doesn’t seem to encounter any of these issues. It might be trickier to fit than Di2 but once sorted is incredibly reliable especially in the awful weather we have here in Wales. I have one 18 month old Di2 system and two eps systems a V2 and a V3 which are now getting on a bit and all I’ve done is charge the battery when needed.
Got it. Cheers. I've never heard anyone complain about di2 so was just curious. Cheers!

XCProMD
Posts: 1015
Joined: Sat Jan 26, 2008 10:25 am
Location: Cantabria

by XCProMD

Exactly. And that’s what killed MTB Di2 so far. Also, when Di2 is working at the top of its lungs it tends to dry batteries.


Skickat från min iPhone med Tapatalk

by Weenie


marathon50
Posts: 19
Joined: Sat Feb 25, 2012 2:28 pm

by marathon50

Hi Seedster
Where did you purchase the V4 11 speed battery.
Thanks

Post Reply