Try to find the real manufacturer. If it's a no-name/no-brand seller from China, then you should know what to expect.
Example:
1. Search for "car battery charger"
2. "Amazon's Choice" result is a brand called Ampeak
3. Google "Ampeak trademark"
4. Ahhhh, "AMPEAK is a trademark of SHENZHEN JIADING ECOMMERCE LTD."
Exercise of trying to find any information about "Shenzhen Jiading Ecommerce LTD" left to the reader.
Also:
1. Try to find a website for both the brand and the manufacturer. "Ampeak" does have a website but lacks company information.
2. Note if the listing is dominated by gushing 5-star reviews and 1-star "what the heck did I just buy" reviews, something you can observe in the Ampeak charger listing.
Example:
1. Search for "car battery charger"
2. "Amazon's Choice" result is a brand called Ampeak
3. Google "Ampeak trademark"
4. Ahhhh, "AMPEAK is a trademark of SHENZHEN JIADING ECOMMERCE LTD."
Exercise of trying to find any information about "Shenzhen Jiading Ecommerce LTD" left to the reader.
Also:
1. Try to find a website for both the brand and the manufacturer. "Ampeak" does have a website but lacks company information.
2. Note if the listing is dominated by gushing 5-star reviews and 1-star "what the heck did I just buy" reviews, something you can observe in the Ampeak charger listing.