From the Manufacturer's instructions that came with my ultra stinger
"There are special considerations to note when using multi-cell rechargeable nickel-cadmium batteries, such as found in the Stinger.
If a ni-cad battery is subjected to repeated and extensive overdeep discharges, such as an aggressive conditioning procedure to eliminate "memory" which runs the battery down completely on a regular basis, it can experience a voltage reversal of one of the individual cells. This may cause a buildup of pressure within the cell which can lead to venting the electrolyte, cell damage... personal injury."
"To obtain the safest and longest service from your.. products...Do not periodically "Condition" or "exercise" your flashlight despite what you may have been told about "memeory"... Streamlight specifically discourages a regular ritual of deep discharging, which is not only unnecessary, but will greatly shorten lamp and battery life.

'nuff said

__________________
Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002