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LiPO Expected Lifetime or cycles
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LiPO Expected Lifetime or cycles

by drewc228 on Mon Sep 20, 2021 12:04 am

Hello. I have purchased a few dozen large (2500mAH) LiPO batteries and have found a high rate of failure after just a few cycles. I am using only the recommended charger boards (I use both USB LiIon/LiPoly charger - v1.2 and the Micro-Lipo boards) set at minimum charge current. After about 10-15 cycles the batteries will not charge beyond 3.2-3.3V (effectively dead). I am careful not to discharge them below this via my own low-voltage cutoff. I am seeing this increasingly happening with the newer batteries I have ordered. Any ideas about what I may be doing wrong, or suggestions about how to avoid this happening? Thanks!

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Re: LiPO Expected Lifetime or cycles

by mikeysklar on Mon Sep 20, 2021 6:35 pm

Had you purchased these LiPo packs through Adafruit?

What temperature are the LiPo's being stored at and used at?

How big a load (current / amps) have you been putting on the packs when they are in use?

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Re: LiPO Expected Lifetime or cycles

by drewc228 on Mon Sep 20, 2021 8:10 pm

Hi, and thanks for the response. These are purchased new from AdaFruit, model Lithium Ion Polymer Battery - 3.7v 2500mAh. They are stored indoors at around 75 deg F. They are used in devices that typically draw around 150-180 mA. Some are still going strong but many will not accept a charge and remain at 3.2V.

Andrew

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Re: LiPO Expected Lifetime or cycles

by adafruit2 on Tue Sep 21, 2021 11:51 am

you are probably timing out, set the charge rate to 500mA

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Please be positive and constructive with your questions and comments.