充 means “fill, sufficient”

じゅう · juu

Also: allot

Kun'yomi (Japanese reading)
あてる, みたす
On'yomi (Chinese reading)
ジュウ

JLPT N1 · Taught in secondary school · 6 strokes

The story

The top of 育, to raise (亠 over ム), standing on legs (儿): picture a child raised until full-grown. 充 is to fill: 充電 is charging your phone, 充実 is a full, rich life, and 補充 is topping something up.

Used in 充電 (juuden, charging), 充実 (juujitsu, fulfillment/richness), and 補充 (hojuu, replenishment)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.