Cal Club Autocross Forums

I can't find anywhere in the literature that came with our Battery Tender Jr. whether one can attach and charge the battery while it's still connected to the car.

Yes you can.

Steve Lepper wrote:Yes you can.

Thanks ... this morning we see whether the little Deka ETX9 held enough charge after 5 days in the parked Miata to start it. Car started right up this morning ... battery seemed strong.