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A rechargeable LED flood light that uses 18650 batteries, supposedly 30 or 50 watts.
I bought the W804 light from Lazada for 1000 PHP (21 USD). I was surprised when it turned up in a box that says 50 watts; since the advert claims 30 watts.
One of the reasons why I chose this light was because it showed in the advert that it could be charged by USB, meaning I could keep the light running for days with the number of USB power banks I already have. Unfortunately the light arrived with a basic AC wall charger with barrel jack.
As soon as I turned on the rechargeable flood light, I knew it wasn't 30 watts or 50 watts, I estimated around 5 watts. When powering the light from my desktop power supply, it drew just 1 amp at 4.2 volts which equates to 4.2 watts.
So not only is this light not rechargeable by USB but it's a pitiful 4.2 watts instead of the advertised 30 or 50 watts.
Fully charged run time: 1 hour usable light. After 1 hour the light dropped to 10% output and continued for a further hour. Although it was producing so little light, it over discharged the batteries to the point where I would assume they would become damaged.
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