Motorola Moto G (2014) — fallo root moto g xt1033

buena noche, e estado intentando hacer el root, pero me da este mensaje cuando ejecuto el flash del recovery desde el pc

C:\Users\ruben\Desktop\adb+fastboot>fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (7692 KB)...
OKAY [ 0.265s]
writing 'recovery'...
(bootloader) Battery Low!!
FAILED (remote failure)
finished. total time: 0.296s

C:\Users\ruben\Desktop\adb+fastboot>fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (7692 KB)...
OKAY [ 0.281s]
writing 'recovery'...
(bootloader) Battery Low!!
FAILED (remote failure)
finished. total time: 0.327s

el FAILES (remote failure) que podra ser?? púes no me deja hacer mas nada..