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d. The wire connection may be loose or the RJ25 cable between the line follower module and
mCore may be faulty. Please re-plug the RJ25 cable for both sides, or change a RJ25 cable
to have a check.
e. The power from battery is not enough. Please change the battery to have a check.
According to our test and research, it is suggested to use rechargeable Li-ion battery or
rechargeable nickel-metal hydride, nickel-cadmium which can be bought from amazon or local
shop. Or Alkaline battery with good quality like Energizer, DURACELL.
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