The batteries must be inserted only in the candle, the candles are conditioned by switching off with the remote control once to this very remote and are ready for use. At least in theory ... because in practice many of the candles unfortunately bad connection to the battery. Then catch the candles to blink because the voltage drops as strong due to the high contact resistance that the candle of a discharged battery runs out. After repeated screwing up and back, coax and one or another gentle blow with the palm of your hand then all the candles light up permanently.
The poor contact makes with semi-used batteries of course more noticeable than with new ones, because the voltage drop amounts to more in this case. The blinking but occurs even with new batteries at times, though much less frequently. This means that you probably never use the batteries until they are really empty - the candle can be much earlier no longer switch.
As a consequence, you have to reckon with, in spite of the maximum theoretical burn time of 150 hours per battery every year to have a complete set purchase new batteries.
Apart liked it the candles with their impeccable fixing technique, the simple setting via ball joint and the pleasant (for LED candles) light. Is the Christmas past, candles including batteries can be clean and tidy tucked into the package again - no comparison with the cost at a string of lights.