Freeplay Sherpa LED Flashlight

No, it is not waterproof.  It is splash proof and will work in rainy conditions.

For best results, the flashlight's internal battery requires a conditioning charge before first use or after long periods without use.  This can be done by administering several vigorous 30 second wind cycles.  Alternatively this can be done by applying a 24 hour adapter charge prior to use.  The flashlight can however, be used immediately in the wind-up mode if required.

The battery will retain about 70% of its capacity after 1 month, 55% after 2 months, 45% after 3 months and 25% after 6 months.

No, you cannot over-wind the internal mechanism.  It consists of simple gearing which drives the alternator, providing power to the internal battery.

No, the winder handle can be cranked in both directions.

It has a 2 year manufacturer's warranty.