ELM327 power on all the time?
 

Sorry if this is already captured in the Torque thread, but I couldn't find this. Is it okay to leave the ELM327 connected all the time? I noticed that there are some LEDs flashing even without keys in the ignition. Will this drain the batteries much?

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I do, no adverse effects ....~5 months thus far

If the consumption is less than 50ma it should be fine assuming you use the vehicle regularly and the battery is healthy.