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I just bought EV3 and started having battery problems. I am using 6 NiMH 1.5V batteries for my EV3. They lasted for around 10 minutes of work and went flat (that's what EV3 kept saying but the voltmeter was showing still ~1.5V each).

I ordered 6 rechargeable NiMH batteries. After installing them the brick started and after 2 seconds showed "low battery" status and shut down.

When I measure the voltage on the turned off brick it shows 9.1V and during startup it drops to 8.5V (still reasonably high, eh?). Two seconds later the brick dies and the voltage goes back to 9.1V.

Has anyone had similar problem? What may be causing this?

  • I would suggest contacting LEGO customer support. The brick should not shut down until the batteries are around 5V (or 6V for the official Li-on battery pack). If you have a way to measure current on the batteries, it would be interesting to see what that is. It should be < 200mA if no motors or sensors are attached. – David Lechner Mar 10 '18 at 15:58
  • Thanks! That's what I eventually did. LEGO support asked me to return my brick for a check and are sending me a new one. – Bednar Mar 13 '18 at 14:50

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