Question: what is 20 hr mean?
Answer: You may see “20HR” on your battery and wonder what does it mean. Simply said it means 20 Hour Rate. ... This basically means that the battery can discharge 1 amp per hour over a 20 hour period. A High Rate battery with the same amperage (20Ah) and with 10HR will be able to discharge 2 amps/hour over a 10 hour period.