My key fobs now work on my cars. Having trouble with 3.0VDC CR2032 batteries going dead in less than a month. Turned out the Voltage was 2.8 volts but not high enough for the key fob or the Sonata receiver? ! Either way, two cars and fobs, the dealership couldn't figure it out. Bought some LCR2032's at 4.6 VDC and have been working great. Even 60 - 100 feet away. There is a big difference in voltage and current and, obviously, the signal. Haven't had to recharge them yet.