4iiii power meter battery life

Equipment
1

Hi there,
I got a 4iii Precision 3 left-side power meter installed in January. I’ve had to replace the battery three times, on a bike that gets used an average of about 2 hours per week, implying a battery life of only like 10-12 hours of use. The coin-cell batteries are super cheap, but it’s a hassle and more importantly, I worry that the seals and battery door will wear out from so much opening and closing. Have other folks had this experience? I have used name brand Energizer batteries from Amazon (an 8 pack or 10 pack). Maybe I’ll buy a different brand of battery from the drug store to see if perhaps the battery is the issue.

Thanks
Sean

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2

I had a 4iiii dura ace for about 6 months
Never had to replace the battery

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3

I have had one for a few years that never gave me a problem, and suddenly started doing the same thing this winter. I would ride it 5-6 hours on weekends and have to replace the battery monthly. I finally just gave up and bought some faveros. If you find a solution, I’d love to hear it.

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4

I have the previous 4iii power meter crank. I’d say I’m probably getting close to the advertised battery life. I use energiser button cell.

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5

I don’t ride my bike with the 4iiii a lot, but I have only changed it once in 4 years. That includes many, many endurance XC races of 4+ hours.

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6

That is not normal. I would call or contact 4iiii for support. You either have a faulty power meter,!or it needs an upgrade, or somehow you have a device (mobile phone or computer or bike computer) that is staying connected.

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7

I have one my trainer bike and ride 6-8 hours a week, use cheap ass coin cells and change it every 5-6 weeks. So some where between 30-50 or so hours

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8

Ive only a 2nd gen 4iii but the battery lasts for ages.

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9

I run 4iii cranks on 2No bikes and the battery life on both are great. Hundreds of hours of use per battery.

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10

I change mine about once every 3 months

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11

My 4iiiiiiiiiiiiiiii will randomly connect to something and drain itself. It can be a coin cell battery/month. It’s either my phone or an AppleTV which I use for Zwift.

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12

There is some problem & I would contact the manufacturer & see if you can get some help. You’ve got some leakage in the HW somewhere. Or it’s not turning off when it’s idle.

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13

It’s been highlighted in their support forums. It seems like an issue in the BLE controller they use, not their software. In any case, I’m probably going to sell my 4iiiiiiiiiiiiiiiiiiiiiii and get the new Favero pedals.

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