FYI - New Hyperion DUO2 now available at multiple sites

[Bill-SOCAL]

watts = voltage x load

So

50 watts = 11.1 x load

50 watts/11.1 volts = 4.5 amps.

Now if fully charged or close to it ~ 12.6 volts

So:

50/12.6 = 3.96 amps.

Basically a 3S pack could be discharged at +/- 4 amps.

So a 5 Ah pack would be fully discharged from a full charge in:

5 Ah/4 A = 1.25 hours.

[detox]

Is that a fully discharged figure? How long would it take to discharge a 3s 12.6 volt pack down to the safe 9 volt level or 3 volt per cell.

[Bill-SOCAL]

2.8 volts per cell is considered the full discharge voltage for most lipos.

Here is the spec sheet for the enerland 5,000 mAh 25C cells

http://www.enerland.com/upload/5000XP-3S3.pdf

So figure pretty close to what I posted above. Probably right around 1 hour.

Full discharge does NOT mean 0 voltage for any cell. NiMHs are considered fully discharged at 0.9 volts per cell for instance.