These things depends on complete system ( led - driver - battery type )
- led ( you can drive led bright but not at full , for example thermal shut off , cooling)
- driver ( you can have low quality driver which run to full , but can not deliver enough current ( low quality MOSFET )
( you can have high quality driver which can run simply on 11A without problems , or is some lover quality led emiter batch which
might burn off when is driver at full )
- battery depends on interal resistance , and chemisty ( some can deliver big energy very fast , but can be empty very fast ( RC airplane
batteries) depends from N*C discharging ( for example 5C means ( 5 time nominal discharging current ))
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for 6 h at full , battery pack should have at least ( 3,7
V led + 2
V driver drop ) x 2,8
A(litle higher current ) x 6
h ) =
95,76 Wh
for geting that capacity you need ( LiOn pack 2S3P =( (3,7
V +3,7
V ) *4,5
Ah (bigest i know for small devices ) )*3 )=
99,9Wh
how it looks such pack ?
this have 75Wh and Dimensions:
137 x 41 x 43mm
Turnigy nano-tech 10000mah 2S 40~80C Lipo Pack (TRA2854 Stampede/Rustler/Bandit compatible)
but remember if that is LiPo ( and is charging like in video through simle 2pole socket it needs also interal protecting and balancing circuit between cells which also neds place -ups )
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my point of view : if something is new on market - don't trust on marketing , simple and very fast parameters analysis tell us truth
final analys trough clamp meter on led or some DAQ (data acquisition ) if you want to belive do it no problem I just like to highlight
mismatch in the data.
---------- Post added March 26th, 2013 at 03:30 AM ----------
with these might fit in to spec , but needed 6 of them to fit in canister with
86,6 Wh - that is close
UltraFire Protected 18650 3.7V "4000mAh" Rechargeable Li-ion Batteries (Pair) - Free Shipping - DealExtreme
but if you read comments at these batteries again
Cons: Measured at 1.0A discharge, charged to 4.05V, capacity read off the charger was 1684 and 1724. So the rated capacity of 4000mAh (obviously overrated) was more than 2x that of the actual capacity. Not much of other cons i can think of other than the overrated capacity.
and normaly this is neverending story......