Don't discard that battery; it might just be in sleep mode and fixable today.
DeWalt's BMS locks the battery if voltage drops too low to prevent potential thermal runaway.
Microscopic debris often prevents charging; clean contacts with 90% isopropyl alcohol for a simple fix.
Connecting a healthy battery to a dormant one can manually reset the internal protection circuit.
Forcing a charge bypasses safety protocols and creates heat risks; proceed with extreme caution and awareness.
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