Using as many internal peripherals as possible.

[louislouis]

Even better, only 33 words.

#CONFIG
  __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _CLKOUTEN_OFF & _IESO_ON & _FCMEN_ON
  __config _CONFIG2, _WRT_OFF & _PLLEN_ON & _STVREN_ON & _BORV_19 & _LVP_OFF
#ENDCONFIG
 
OSCCON =     %00110010 ; Clock 250kHz

TRISA   =    %010000   ; RA4 input for battery measurement, rest output
ANSELA  =    %0000     ; ADC Disable
OPTION_REG = %10000111 ; Disable internal pull-ups, TMR0 On, prescaller to 256

FVRCON  =    %10011000 ; Internal reference to 2048mV

CM1CON0 =    %10100110 ; Comparator output to C1OUT, switch on LED if voltage is below ref. 2,048V
CM1CON1 =    %00100001 ; C1IN1- pin is RA4, comparator voltage input, C1IN1+ positive input to FVR set to 2,048V

LATA    =    %000010   ; init state of pin RA0 and RA1, LEDs connected to these port

Main:

if INTCON.2 = 1 then LATA = LATA ^ %000011 : INTCON.2 = 0 ; if TMR0 owerflow flip LEDs, then clear owerflow flag

goto main

I think, reached the limit of optimization.