Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not enough oomph

It is just as advertised, a battery maintainer. Liked the LED light that showed product was operating and the two sets of connectors. Therein lies the problem. The alligater clips positive polarity is the male probe on the connector and in the effort to not short out the solar collector connected the battery first before connecting the plug. Accidentally dropped the plug and the probe hit ground producing a wake up spark. Recommend manufacter reverse the polarity on the plug having the positive on the male probe at the solar collector side will not cause any problems since there is no return path with negative being the female side. Liked the concept so much opted to buy the 5 watt model to get more oomph of a trickle charger. By the way the 5 watt model has the same design flaw and does not have the LED light but is just what I wanted to keep the battery on the spare car charged without having to run it (waste gas) to do what the solar charger is doing.