Instruct: Classify Amazon reviews into positive or negative sentiment
Query: faulty designed circuitry

The Fenix P1 may seem to be a marvel, due to its compact size, turns out to be a dud. The circuit board controls power regulation however if the power of the battery is below 70%, the LED brightness immediately drops from a cool 100-90% to a very weak/dim glow (I would say about 10-20% of full brightness).Initially the contact seems very glitchy when using less-than-full but still usable CR123A battery, however this was due to the power regulator circuit.Some users have had to remove the foam ring at the bottom of body of the light, so that the contact would be improve.. Doing this will not improve the contact.. It only makes the battery rattle around inside..Anyway, this was a waste of money.. My dad's flashlighter combo was actually brighter, running on a CR3023... sad.