AUTDER 6V/12V 5A Fast Smart Battery Charger with Detachable Alligator Clips and Ring Connectors Automatic Battery Maintainer

Charger very easy to use and easy to be confident in its function. Occasionally, one of my cars will deplete it's battery due to an engineering mistake. The battery is still good, but it is run down by that engineering problem. It has happened twice during COVID-19. This device restore the charge overnight each time.What I do not like is the device does not sense the battery voltage and change to that voltage. Each time, I have had to change from the default 6V charge setting.

Just attached it to the battery and is registering correctly- The battery was fully charged and will check over the winter to see that this maintains a full charge.

I'm using it for maintaining our travel trailer battery over the winter. Simple to use and easy to install

I've NEVER written such a negative review. I have several cars and motorcycles. EVERY charger with an SAE style plug has the 12v "hot" lead shielded by the female side of the plug. Not this one! If you use the supplied battery hookup lead, you'll leave the 12v side of the plug exposed to grounding. Adding insult to injury, there is no fuse on the hookup lead. Direct short across the battery! If you would use this charger on other vehicles with an existing hookup lead, the polarity will be incorrect. This product should be removed from Amazon...

Caution! I would have thought there was a standard regarding the polarity of the bullet connectors-bit this unit is opposite my other chargers, so do not interchange this unit with Battery Tender products as the polarity is different!

Hadnt used it yet but seems nice.

could use a longer cord for the attachment to the bike

These are garbage! They destroyed one battery and don't charge like they are supposed to. Twice the battery was dead. I bought four of these and have had to throw them all out. The polarity is also reversed from other battery tenders. DO NOT WASTE YOUR MONEY!