It sounds like you have a bad battery. I'd try putting a brand new battery on there, and see if a new one drains in 5 days. Do you have any friends or an LBS you could borrow one from?

Replacing the battery is not that simple… with Campy all the leads are connected to the power unit, plus it's inside of the frame, so if I'm taking it out, then I might just as well return it to the LBS for a warranty claim. It's a brand new power unit that was installed in early December….

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin

Okay, noob question.

The big difference between Campy/Shimano/SRAM is brifter ergonomics, yes? But for TT setups using bar end shifters or buttons, why spend the extra money for campy EPS vs Shimano Di2?

believe the EPS drive train components are rebuildable.

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Try using a higher amperage charger.

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res, non verba

Very simple, when you have 6 bikes and all are Campy, it makes perfect sense to also use Campy on your tri bike. This way, she can use the same wheels on any on her bikes. Plus she really likes Campy.

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin

How could you do that? The Campy charger is what it is...

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin

I got a similar problem but with an external EPS battery, that discharges after a couple of weeks without use. I have put now the switch-magnet in to switch off the whole system when it is not in use. See if that helps.

Id find out the output of the charging system you are currently using, go to an electronics store and buy a compatible charging charging setup that has a bit more amperage .

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res, non verba

Are you wrapping the magnetic band around when not in use?

Ah, wheels is a great reason. Not that vanity/matching is a bad one, if your budget permits.

More carbon, and the Campy aero crank might also be bling as well.

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The connector for the internal battery is proprietary and hardwired into the charger... the above suggestion unfortunately won't work (although greatly appreciated none the less)

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin

11 speed Shimano/SRAM and 11 speed Campagnolo seem to match cassette spacing very closely, certainly well enough to be effectively interchangeable.....
I like Campag too though.

My battery discharges lets say within a month with about 200 miles even when I put the switch-magnet in to switch off the whole system when it is not in use. The battery level indicator system does not seem to work properly, since the battery is at once empty although the lamp was green before (there is a system of different colours which should indicate the charge situation). Also when charging it seems to skip the partially charged situations.
Charging once a month is acceptable, but I hope the situation will not become worse.
The problem is, I installed the system myself (you can't do much wrong) so I do not know what the guarantee-policy of Campagnolo is in such cases.
It is a hard problem, since you can't concentrate on the battery alone, there could be a leak in some other component. (I once had a watch which quickly discharched, but the problem was not the battery).

Audiojan, how is your situation right now?

For the external, Campy had one batch (one of the first...) that failed. You should probably contact them to discuss the issues and they may very well replace it under warranty. You will need to have a copy of the receipt handy.

I'm having Campy replace my internal battery under warranty. There's no known issues (after talking to Campy), so I'm thinking this is a one off. Either way, Campy has pretty good customer service, so no worries.

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"Suddenly the thought struck me. My floor is someone elses ceiling"-Nils Ferlin

Thanks I'll try that.

Which is as always not easy because I need my bike now. When Campy is willing to exchange the
battery I'll try to make up a time window with them in which I can refrain from the bike.

After my main race in may (a 70.3, where the initially fully charched battery ran out during the race but just after the last summit so that I could finish the race in one gear) I sent my external athena battery with the receipt to campagnolo. They sent me a new battery straight away on guarantee. It seems that the problems are solved now. 5 weeks ago I did another middle distance, before that I charged to be sure but that was the last time I charged and the system still has power now.