Doing the maths, to charge a 2500mAh battery in 15 minutes you're going to be putting in over 10 amps (which is a lot for a small consumer-electronics device) and I wouldn't find it at all surprising if the charger got hot (and consequently smelled a bit) along the way. I was not previously consciously aware of their availability. Take care! Does the fan cool the batteries, or charger electronics, or both? Edit to add: I've just done a Google search and found Energiser and Rayovac brand 15-minute chargers. Can you identify whether the smell begins when charging begins, or only happens toward the completion of charging? Are the batteries you are using actually rated for a 15 minute charge? The rate at which gas can be liberated internally within the cells (especially under fault/overcharge) goes up with the charging rate, and if the battery vent is not designed for a high enough rate there may be a safety (explosion) issue to consider. That said, a 15-minute charge is very fast. Modern chargers monitor the battery temperature and/or voltage profile during charging to establish when they are "done". If the charger attempts to put more current in once they are fully charged then (a) the batteries rapidly heat up since they cannot chemically absorb any more energy, and (b) they vent hydrogen gas (which will, over time, reduce the capacity of the battery). ![]() The general principle is that (very) fast charging is mostly okay as long as the main charge is cut immediately the batteries are full. I've never charged such batteries faster than about a 3-hour charge.
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