# acpiconf -i batt
Design capacity:        2200 mAh
Last full capacity:     1310 mAh
Technology:             secondary (rechargeable)
Design voltage:         10800 mV
Capacity (warn):        110 mAh
Capacity (low):         66 mAh
Low/warn granularity:   264 mAh
Warn/full granularity:  3780 mAh
Model number:           UM08A31
Serial number:
Type:                   Lion
OEM info:               SANYO
State:                  high
Remaining capacity:     100%
Remaining time:         unknown
Present rate:           773 mA (9129 mW)
Present voltage:        11811 mV

# acpiconf -i batt
Design capacity:        2200 mAh
Last full capacity:     1310 mAh
Technology:             secondary (rechargeable)
Design voltage:         10800 mV
Capacity (warn):        110 mAh
Capacity (low):         66 mAh
Low/warn granularity:   264 mAh
Warn/full granularity:  3780 mAh
Model number:           UM08A31
Serial number:
Type:                   Lion
OEM info:               SANYO
State:                  discharging
Remaining capacity:     95%
Remaining time:         1:28
Present rate:           846 mA (9622 mW)
Present voltage:        11374 mV

# acpiconf -i batt
Design capacity:        2200 mAh
Last full capacity:     1310 mAh
Technology:             secondary (rechargeable)
Design voltage:         10800 mV
Capacity (warn):        110 mAh
Capacity (low):         66 mAh
Low/warn granularity:   264 mAh
Warn/full granularity:  3780 mAh
Model number:           UM08A31
Serial number:
Type:                   Lion
OEM info:               SANYO
State:                  charging
Remaining capacity:     95%
Remaining time:         unknown
Present rate:           773 mA (9286 mW)
Present voltage:        12013 mV

Скрипт отображающий состояние батареи.

cat Batt_state.sh
#!/usr/local/bin/bash

echo `acpiconf -i batt | grep "State" | awk '{print $2}'`

exit 0

# cat Batt_r_capacity.sh
#!/usr/local/bin/bash

echo `acpiconf -i batt | grep "Remaining capacity" | awk '{print $3}' | sed -e 's/%//'`

exit 0

Для того чтобы SNMP знал откуда брать состояние батареи и в какой oid выкладывать значения. Нужно в файл /usr/local/share/snmp/snmpd.conf добовить такую строчку:

extend .1.3.6.1.4.1.2021.50.1 r_capacity /scripts/Batt_r_capacity.sh
extend .1.3.6.1.4.1.2021.50.2 state /scripts/Batt_state.sh

Перезапускаю SNMP

# /usr/local/etc/rc.d/snmpd restart

Проверяем выдаются ли наши значения по запросу:

Ссылки:
https://www.freebsd.org/cgi/man.cgi?query=acpiconf&sektion=8&manpath=freebsd-release-ports