The new energy charging battery cabinet makes a sound

Does a battery get quieter when charging?

Correct. It gets quieter as it slows down close to full, and once its finished charging at 100% the noise will also stop fully. Also I should mention that I'm younger than most here so can hear the high pitched noise loud and clear.

Why do batteries get hot when charging?

It is not unusual for batteries to become warm when charging. The faster the batteries are charged, the hotter the batteries will become. Possibly the odor is coming from the outside of the batteries (something on the label) or maybe the charger itself.

Should you mix a rechargeable and a non-rechargeable battery?

You should also never mix old and new batteries, rechargeable as well as non-rechargeable (due to capacity differences, rechargeable batteries lose capacity over time; newer batteries often have a higher mAh (capacity) rating as well due to improvements), so they should all be replaced at the same time.

Is the sound of Zoe charging annoying?

The sound of Zoe chargingisn't annoying or especially intrusive in my opinion. It doesn't travel very far, and if you sit in the car or in the house with doors/windows closed you won't hear it. It’s a good point that in reality we probably won’t charge it that often.

Why do NiMH batteries smell?

The following tips/information should be helpful: A small amount of Hydrogen gas can be emitted from NiMH batteries during charging. However, it is unlikely that this is the source of the odor. It is not unusual for batteries to become warm when charging. The faster the batteries are charged, the hotter the batteries will become.