I have a Deltran Battery Tender Plus hooked up to my 2008 Elise, with an Optima battery. The Battery Tender will not switch to Green (ie float/maintain) with the battery connected to the car. It stays Red for 72 hours and then switches to alternating red/green flashing, which means the safety timer has triggered. If I disconnect the battery from the car, the tender will switch to Green within a couple hours. No lights or accessories are left on, and the alarm is shut off except obviously the immobilizer which stays on. I've also tried connecting multiple different ways to the battery to ensure I was getting a good charge connection. I spoke with Deltran and they think the car has a parasitic draw close to the 1.25A rating of the tender. However, that would seem like a really high draw to me with nothing else turned on in the car. Anyone else experience this?