actually, it's pretty normal for the 4U to consume batteries within 1-2 weeks. my blue one runs out average.. 2 weeks? i'm assuming that the batteries used are the ones that came in the package. those are known for being horrible, with some running out within 30 hours. NFC features can be a drain, but it doesn't drain that much.Umm, that's the low battery screen.But its weird for a 4U to eat its batteries so fast. Were they used? If not then were you constantly using the NFC features because it CAN drain the battery pretty quickly
the 4U accepts any batteries as long as they're AAA. although if batteries run out upon inserting them, they're likely dud batteries and you should try a different brand.oh and for the battery change thing were they used?Also some tamas don't like certain brands of battery.
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