Yup!

Radio and blower motor are each on a 30 amp fuse. Obviously you're not pulling that much without the radio at full volume or the fan on max, but that gives you an idea of just how much draw those two items have.

We had this come up for discussion here before. A person was sitting in their car listening to the radio during lunch. Was concerned about the wear on the small battery and whether or not it would start after work. I believe the forum's consensus was that they would be best off getting a portable radio and fan that could be recharged. Otherwise, you're putting quite a strain on the battery regardless of it's size.

 

 

Ok, so I took some current readings and found some interesting findings. If OP did have the fan on it must have been on ACC or his car is different then mine as I could not get the fan to come on when on Pos.1.

2009 Honda Fit Sport w/ Navigation

Current readings were taken off the negative battery cable using a Fluke 376.

Car off, key in position 2 (Acc), DRL are on:

Radio Volume - 10
Fan Speed - OFF
4.4 amps

Radio Volume - 10
Fan Speed - 1
6.5 amps

Radio Volume - 10
Fan Speed - 2
8.5 amps

Radio Volume - 10
Fan Speed - 3
12.4 amps

Radio Volume - 10
Fan Speed - 4
16.8 amps

Radio Volume - 15
Fan Speed - 1
6.8 amps

Radio Volume - 20
Fan Speed - 1
6.8 amps with spikes as high as 7.8 with hard bass hits.

 

Very thorough, GolNat. Thank you.

I have no expertise here, but I gather from all the people who contributed to this thread that running the radio and the fan with the engine off puts too much draw on the battery. I'll keep that in mind going forward.

Thanks, all.