Could a switch-mode power supply be used to charge individual cells or groups of cells within the string of cells which is supplying the power to the switch-mode power supply?
If it is possible to connect a switch-mode power supply as shown in the diagram, then it would be a nice on-board backup charging system for unbalanced=unequal capacity cell packs. Very handy for situations when the Vectux would usually end up crawling along or being pushed by me - NO FUN AT ALL! This situation arises whenever the entire 102-cell NiMH string has been drained to the capacity level of the lowest capacity cells. (Usually about 45km)
When extended range is needed the switched connection between switch-mode power supply and the low capacity cells could be closed whilst still riding along, or the scooter left to stand for a while whilst recharging "itself".
The switch-mode power supply could possibly also power the indicators in a "HAZARD WARNING" fashion when needed.
This will lead to a problem later during proper recharging at a power point:
The "good" cells would then have more "rechargeable capacity" than the amount which the weak cells are capable of absorbing. The weak cells might, in extreme cases, even be fully charged already when the other cells are empty. The weak cells might therefore start venting due to pressure build-up when the stock-on-board-charger puts 10A through the string.
This problem could however be controlled more easily than pushing the scooter home!
Have a look at the diagram and tell me if there is something fundamentally wrong with this idea, please!