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The 12cm fan I bought is 0.25A at 12V, so I can use it most efficiently if I have a 12V AC adapter.
But I wanted to mobilize the air purifier, so I would either prepare a 12V battery or boost the mobile battery to 12V. I chose the latter because I didn’t want to mess up too much.
The configuration diagram looks like this.
I measured the current at each point.
The boost circuit I bought was quite inefficient. I can not help because it is about 250 yen with 5 pieces.
If such a power bank is used, the efficiency drops further because two booster circuits are connected.
My 18650 cylindrical lithium-ion battery was 3000 mAh in the display, but when I used this mobile air purifier as the ability, it was 3 and a half hours.
11.1 Wh as 3.7 V 3000 mAh.
It runs out in 3.5 hours.
If I trust the battery display to be 3000 mAh, 3.2 Wh.
If it is 2.85 W with one boost circuit, there may be about 3000 mAh of this green 18650 lithium ion battery!
That’s a surprise.
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