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| + | [* icon_note] The Pono charge circuit does get warm when charging at maximum. The battery, if we have done our job well, will not. The following test was done with a depleted battery. |
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| + | [* black] In photo 1, you can see I have connected the USB charger and the protection board temperature is elevated at 31 degrees C after 1 or 2 minutes of charging. Ambient temperature is 24 degrees C. |
| + | [* black] In photo 2 the minus terminal of the battery is is 25 degrees C and rising. Eventually the whole battery reached ~30 C. |
| + | [* black] In photo 3 you see the business of charging heats up U50 quite a lot. The maximum temperature I found was 66 degrees C, the related components were also warm. I think this normal and working as designed. After an hour of charging the battery voltage climbed, charge current fell and the temperature of U50 dropped to 40 C. |
| + | [* icon_note] So the Pono after receiving a new battery will get warm (as it did when it was new). The end by the USB on the front panel is the warmest spot. |
| + | [* icon_note] My rule of thumb is - around 60 C you will pull your finger off a hot IC. So U50 is too hot to touch at 66 C but safe. |
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