In case of Samsung devices using CM11:

• Requires edit "CM11/android/device/samsung/smdk4412-common/BoardCommonConfig.mk" adding:

   ...
   #Charging mode
   BOARD_CHARGING_MODE_BOOTING_LPM := /sys/class/power_supply/battery/batt_lp_charging
   BOARD_BATTERY_DEVICE_NAME := "battery"
   BOARD_ALLOW_SUSPEND_IN_BETTERCHARGER := true
   BOARD_SAMSUNG_DEVICE := true
   BOARD_IMAGES_ON_SYSTEM := true
   FORCE_REBOOT_WHEN_FULL := true
   ...

• Requires edit "CM11/android/device/samsung/smdk4412-common/common.mk" adding/replacing:

   ...
   #Charger
   PRODUCT_PACKAGES += \
   	bettercharger \
   	bettercharger_res_images
   ...

  NOTE: By default CM not use "charger" for Samsung devices, it use private binary blobs playlpm

• Requires edit "CM11/android/device/samsung/i9300/BoardConfig.mk" adding/replacing:

   ...
   #Charging mode
   BOARD_BETTERCHARGER_RES := device/samsung/i9300/bettercharger/images
   ...

• Create folders "bettercharger/images" on "CM11/android/device/samsung/i9300/"

NOTE: We don't modify lpm.rc because all prior ROMs use private playlpm binary, and we use the same path for this reason.

By default charger is integrated on recovery for Nexus devices, maybe its required compile it the first time:

THREADS=1
croot
time make recoveryimage showcommands -j${THREADS}

And the rest compilations, you can only compile bettercharger:

THREADS=1
cd ~/CM11/android
source build/envsetup.sh
breakfast i9300
export USE_CCACHE=1
cd system/core/bettercharger/
time mm

The compiled output must be in: ~/CM11android/out/target/product/i9300/root/system/bettercharger Using the same structure that goes to internal memory

But for correct execution we need to replace the original binary "/system/bin/playlpm" with a script like this:

#!/system/bin/sh
mkdir -p /res/images
/system/bettercharger/bettercharger

The "mkdir" line is a "workaround" because ower binary expects to find this folder in recovery, but we don't use this folder.