I have not noticed it getting too warm but not happy with the mismatch

I would give this light 5 stars for the price except it arrived with a 4.2 Volt Battery pack and an 8.4 V charger?? The charger does not shut off since it never achieves the 8.4 V charge state. I am also concerned about the battery going thermal runaway? I have not noticed it getting too warm but not happy with the mismatch.

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