Hi Gilles!
I tested a Cinq5 (Tout Terrain) Smart Power Pack II back in 2014 and posted a writeup and discussion of its operation here:
http://thorncyclesforum.co.uk/index.php?topic=10387.0Mine is still(!) working, a pleasant surprise after all this time.
I'm surely sorry you have had trouble with yours and I hope you will soon receive the warranty replacement. It can surely be frustrating to have something malfunction or break and then encounter a delay in resolution.
I can't speak to how things are going at Tout Terrain/Cinq5, but I do know the entire bicycle industry is currently struggling with severe supply-chain problems from manufacturing to transport/logistics to stock-location services worldwide. For some insights, see:
https://www.bicycleretailer.com/opinion-analysis/2021/06/14/jay-townley-supply-chain-nightmare#.YXJtQRrMJhE...and...
https://corinspired.com/global-bicycle-production-is-hit-by-supply-chain-delays/...and...
https://www.bike-eu.com/market/nieuws/2020/12/production-increase-alone-will-not-solve-supply-chain-shortages-10139402If it is a comfort, I've found warranty replacements for everything are taking much longer than usual, thanks to Covid-related work-from-home schemes and reductions-in-force as the industry adjusts to new demands. I recently had to make a warranty claim on a wearable LED headlamp. Based on past claims with that same company, I had expected a reply the same day; instead it took nearly two weeks to hear from a human after receiving an automated reply that assigned a case number. They did not baulk at all on my claim and graciously told me to keep the (faulty) original while they shipped the replacement. Again, there was a delay and I received the replacement after a couple weeks -- in the wrong color, the only one they had available. So...four weeks total to resolve this last claim compared to about 10 days for the pre-Covid experience. They did make note of probable delays due to short-staffing and home-work in their automated email reply so this was expected. Like you, I've found it helpful to be polite and understanding no matter how frustrated, as folks at the other end are usually overtaxed and have had to deal with some unhappy customers. Being nice seems the best strategy to ensure a pleasant, speedy resolution despite shortages.
As for repair, a friend of mine in Aachen German operates a contract warranty-repair service for a number of manufacturers. When defective products are returned, they are the shipped to his firm where they are tested and repaired, then either sent directly to the consumer or sent back to the originating company to forward to the original consumer. This is cheaper for the maker and eventually provides feedback as to which parts are most likely to fail so changes in manufacture can be introduced to ensure greater reliability. Unfortunately, this can all cost time. I have no idea if TT/Cinq5 provides warranty repairs on-site, through contracted repair centers, or via exchange for new or remanufactured units. All three are possibilities for many firms. Particularly with international claims, there can be reimbursement, contractual, even regulatory problems with having a local seller or international distributor make the warranty exchange rather than the maker; some may not be authorized to do so.
This can even be true in the case of bicycle frames. I was able to complete the process entirely through a local dealer who handled everything on my behalf in one case. In another instance, I had to actually ship the frame to the maker for evaluation and eventual authorization for a replacement. In yet another case, a frame made in Japan to my specifications was defective -- the vertical rear dropouts were misaligned 1mm vertically, causing the rear rim to cant to one side. The bike had brazed-on centerpulls so the brakes could not be adjusted and one pad rubbed all the time/braked unevenly. The company whose name was on the bikes was really just the designer and distributor in my country with the frames made under contract in a series of places in Japan depending on the model. Some were made by large factories while my made-to-measure model was produced by a husband-and-wife team of hand-builders. Frame finishing was contracted out even further -- for example, some elderly ladies did the hand-lining/pinstriping using horsehair brushes, one frame at a time. Despite the promise of a lifetime warranty against frame defects, there proved to be no recourse in my case, so rather than mill through the chrome of the lower dropout, I machined a spacer for the higher one and bonded it in place using an etching epoxy. It solved the problem and has remained in place for the last 41 years.
Fingers crossed your replacement will arrive soon.
Best,
Dan.