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A safe life expectancy of the cells can then be assured. The
so called Memory Effect is the common term for the reduction in the capacity
of the cells as a result of charging the cells in a partially discharged
condition. (e.g. A wireless telephone handset has a battery life of 24 hours,
but is replaced on the station and therefore charged after 3 hours).
The common technique for overcoming this is to fully discharge the cells
before charging. We regard this as being more harmful for underwater lamps
with between 5 and 20 cells.
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The constant discharge down to the cut-off voltage limit can
overload individual cells and disrupt the balance within the matched cell
pack.
This may result in an individual cell "dropping out". We recommend
that for every 10 to 20 cycles where the cells are partially discharged,
that the lamp is fully discharged until the built in discharge protection
turns the lamp off.
The more often the cells are taken to their minimum capacity, the higher
the strain on the individual cells.
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