feat(bat): set charging current 2.8a

lin

2025-08-01 633231e833e21d5b8b1c00cb15aedb62b3b78e8f

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CC=gcc
CFLAGS+=-Wall -Wno-missing-braces -Wno-parentheses -Wno-switch -O2 -g -c -I.
O=o
AR=ar
ARFLAGS=rvc
NAN=nan64.$O