15 miles with no charging, no battery - and just one segment..?!

Okay, I'm calling the dealers at 8:30 but thought I'd ask your valuable opinions.
Up to 11,500 miles, a week after my first service and my first real issue....
I notice a sudden drop in power, but think nothing of it as I'm up on the Moors, driving uphill.
After digging up bits of a Junkers 88, we start a 10 mile descent from the Moors.
After a mile I noticed, for the first time ever, my battery only had one segment coloured blue - it has never been less than 2.
As I rolled down the hills, no braking charged the battery - though it was shown as occurring. No accelerating, or rolling without throttle dipped added charge to the battery.
At the bottom, no electricity was available at all.
After 15 miles, the battery very slowly went from 1 to 2, then 3...after 15 miles it appeared to be back to normal.
Someone forgot to tighten something at the hybrid health check...?!
I rarely overtake, but if I do, I don't want to run out of power mid move...nor do I want my hybrid car to become a petrol car.
Anyone experience a similar failing? Any ideas?

 

Cheers - so on previous models, every now and again it is normal for the hybrid system to randomly fail for periods of time? I'm not glad to hear that! The loss of expected power during an overtake, or pulling out of a junction I don't believe to be safe.
I also don't fancy watching my economy take a hit. I hope the dealer can help. I popped in this lunchtime, but there were only salespeople in - they want me to call as soon as the service dept. opens.

 

Will do. I may have been the first Gen 4 to be serviced at the local dealers. They had a glitch with their hybrid health check computer that added to the wait. I was told the connection issue was with their system, not the car. It meant I had no print out of the hybrid heath check to take with me.
I was told it would be on "My Toyota" - where I can see the notes say hybrid health check carried out, but that was all I could see - not what actual checks were performed and the status theof (though

 

My hybrid system info showed the flow of charging energy from descent and acceleration and rolling, but the battery showed just one of the 8 segments full. No electricity was available in EV mode, or as an assist to acceleration. I forgot to look if it falsely showed it was assisting on the hybrid energy screen. I noticed a strange lack of power initially, which would have been the loss of the battery power as I accelerated after turning a corner. As I was looking for a place to park, though annoyed, I put it down to gradient and altitude.
Descending I was looking forward to arriving at the bottom with a full battery - 7 or 8 segments - and maybe 100 mpg indicated - so I was shocked shortly after setting off to see a single battery segment in blue (never seen less than 2, no matter how hard I've tried to deplete the battery fully!).
Still the one segment at the bottom of the hill. I think there was still drag without the throttle gently pressed, but no charge whatsoever.
I tried accelerating hard once on the flat and had the same weak response, not the normal surge of power. Then the battery very slowly charged, ending up performing normally.
I was able to accelerate and overtake normally.
Though I am now a bit worried!
It will make me late for work, but I can't risk damaging the car, or finding myself losing power at a crucial moment.

 

On that occasion i had NO battery assist or EV. Of course i could still overtake, but at reduced power, on petrol alone.
Imagine pulling out to briskly overtake a lorry, mid way through the move your power drops off...
I understand normally you cannot use up the last of your battery, it always leaves enough for assist. Then you always have at least 2 bars - this time just one.
Apart from this occasion, i have always had a minimum 2 bars of battery, and never lost the battery assist during acceleration.
Anyway, the service chap thought it unlikely he could he see what it was unless it happened while he had it...if it was taken out it was for about a mile...! At least they cleaned it really well, and i had an Aygo for the day. That was suprisingly fun!
Fingers crossed it wont happen again.
If it does, he requested i have a passenger film it, the displays etc..

 

On that occasion i had NO battery assist or EV. Of course i could still overtake, but at reduced power, on petrol alone.
Imagine pulling out to briskly overtake a lorry, mid way through the move your power drops off...
I understand normally you cannot use up the last of your battery, it always leaves enough for assist. Then you always have at least 2 bars - this time just one.
Apart from this occasion, i have always had a minimum 2 bars of battery, and never lost the battery assist during acceleration.
Anyway, the service chap thought it unlikely he could he see what it was unless it happened while he had it...if it was taken out it was for about a mile...! At least they cleaned it really well, and i had an Aygo for the day. That was suprisingly fun!
Fingers crossed it wont happen again.
If it does, he requested i have a passenger film it, the displays etc..

 

Yeah - i work on a business park. The exit road that joins the main road is uphill. 3 roads within a couple hundred yards exit the same estate onto a 40 mph main road (where most people are exceeding 40 mph).
At rush hour, with a half dozen cars behind me, i have to accelerate from dead stopped on a hill to a right turn into fast two way traffic.
Its not a great junction - i never pull out dangerously, but i often have to do it as fast as possible.
It is exactly here where the unexpected removal of much of my power could have disastrous consequences.

 

Being in the UK Mendel, my right turn is your left turn, etc!

 

Thanks. The car is back to normal after those EV-less 15 miles. I imagine if i ever see a single segment again, i'll be ready for it. I keep the battery status in my HUD and on the energy monitor, so will try not to be taken by suprise.
As the car has otherwise proved awesome, i trust it may have been a one off.