Does this mean little and often with the occasional deep discharge?
Not quite, though it could do if the charge state could be accurately measured. The key thing for long life of a battery in constant use is avoiding the 20% at each end of the charge, using it only between 20% and 80% of charge.
However, that's not the whole story by far. Very important is the rate at which the content is used, regardless of the charge level, and our e-bike motors do tend to give batteries a rough time through drawing high currents, that reducing life. Its a problem of battery size and weight, versus the e-bike's current requirements. Ideally for long life a very large capacity battery should be used, but ideally from the weight and size point of view, an e-bike needs a small and light battery. Therefore the manufacturer has to choose a compromise, not perfect for either smallest size or longest life.
We have a practical example with the orbiting satellites. For obvious reasons their NiMh or lithium batteries have to last ten years, so they are specified at seven times the capacity needed to do the job. Each 24 hours they go into the dark phase out of sunlight and one seventh of the current is used then, this then being topped back up by the solar panels as they get back into sunlight. That way they easily last for the 3600 or so daily charges that are necessary.
Both the usage and charge in those satellites are at very constant and gentle rates, completely unlike our e-bikes where the current varies hugely, very heavy usage climbing hills but little used cruising on the flat.
You can see from all this that we have no hope of realistically doing very much to extend e-bike battery life beyond the natural type abilities. Therefore I think it best to just use the batteries without worrying too much for their welfare, accepting their limitations.
Deep discharge with lithium is only necessary for new battery conditioning when that's recommended, or when it's needed for meter re-calibration as on the Panasonic unit battery at times.
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