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Mastodon: AboutGet the appKeyboard shortcutsView source codev4.4.0-nightly.2025-04-01

#charges

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Chris Vogel

So... I ordered a new #battery pack for the #Xiaomi Dreame vacuum cleaner. It has not been an official replacement part, because I didn't find one. The battery worked for three month and then went flat.

Shortly after the vacuum cleaner stopped working and I put it on my #flohmarkt just in case someone would need replacement parts.

For all the rechargeable batteries in our household I had bought a charger that also #charges #LiIon and has options to measure the #capacity of cells.

These are the capacities of the #Samsung INR186050-25R cells I removed from the battery pack of the cleaner (mAh): 2366, 2294, 2262, 2254, 2321, 2267, 2257.

Looking at the #specs for the battery I found that the capacity should be 2500mAh. There's also a curve "20A discharge cycle life of 25R" that shows that a capacity of ~2200mAh is reached around charge cycle no. 150 of 250 cycles being tested. ~2300mAh is a value for around 100 charge cycles.

I'm wondering whether these cells can still be safely used in some other application.

picture of seven battery cells labeled with the capacity in mAh and the internal resistance
screenshot of a diagram labeled "20A discharge cycle life of 25R"
picture of the printing on one of the battery cells "INR18650-25R M SAMSUNG SDIEM 5 TKV1"
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