Battery Tender fried battery?

[PrivatePilot]

Both are supposed to have the reverse current protection, so perhaps it's defective?

I'd do tests to see if there's a draw on the battery with the bike just sitting however first - charge the battery back up and disconnect the tender and see if it gets depleted again, or if you have an amp meter wire it inline on the positive cable with the ignition off and see what it shows for milliamp draw.

 

[Roadghost]

Check the water level in the battery. If it is low put some distilled water in and charge it. Tenders can evaporate battery water on older batteries gradually and destroy them. It also might just be time for a new battery.

 

[H4x0rz]

Check the water level in the battery. If it is low put some distilled water in and charge it. Tenders can evaporate battery water on older batteries gradually and destroy them. It also might just be time for a new battery.

Agreed. But it's a two week old battery

 

[H4x0rz]

Know this isn't the most exactly scientifical way to prove my theory. But I charged my battery probably about half charge and left my bike without charging it. Gave the same time period as it was unplugged and came back to the bike and the battery Started the bike right up.

The reverse charge protection is on the battery tender plus model (mentioned in the faq). I'm assuming different on the battery tender jr.

Though it does have reverse polarity protection etc there is no mention anywhere on the manual or their site that states that the Jr has reverse charge protection.

dont remember where online I read but someone did do a test on a standard battery charger vs the battery tender jr and found a reverse current of 112 micro amps from the Jr compared to a less than 1 microamp from a regular charger so I guess that will do!