Im using duracells, had rechargables but got tired of forgetting to charge them then get out to where I run my cars and find them dead lol. So just just went to akalines plus you get the little extra voltage, not sure if it matters that much.
Would be interesting to hear if anyone other then mine does this, like I said I have 2 of these and if I stick the low voltage battery pack in either one it does this.