Any older cold blooded Rockets other than mine?

Try a real battery charger a battery tender only puts out 2-3 amps not enough to charge fully a cold battery. Put it on a 10 amp trickle charger and in a bit I bet it spins right up.
 
Well, not quite there yet, looks like is the solenoid, after trying 3 different batteries with same results, came to the conclusion that i need to get my hands dirty.