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Please specify the battery type in your question. Include chemistry (e.g. lead-acid, Li-ion), voltage, capacity (in A·h or W·h), number of cells and how they are connected (series or parallel) .

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What could happen to my cells? I overcharged them a bit

I left my 3.7 V Li-ion cells charging for a long time with a low current 5 V charger. Now when I check the voltage, it is at 4.31 V. The cells didn't get hot, not even warm, but I'm afraid of what thi …
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