A Charge

[Kate1]

"The battery has (a) full charge."
"The battery has (a) 40% charge."

"The battery is at (a) full charge."
"The battery is at (a) 40% charge."

"The radio needs a battery with (a) full charge."
"The radio needs a battery with (a) 40% charge."

Do I need the article "a" in these sentences?

[5jj]

I imagine that you have had no response because some of us are not sure! I would say, "The battery is 40%/fully charged". Here is my guess at your sentences:

"The battery has a full charge."
"The battery has a 40% charge."

"The battery is at (a) full charge."
"The battery is at (a) 40% charge."
(Neither of these sounds very natural to me.)

"The radio needs a battery with a full charge."
"The radio needs a battery with a 40% charge."

[billmcd]

I imagine that you have had no response because some of us are not sure! I would say, "The battery is 40%/fully charged". Here is my guess at your sentences:

"The battery has a full charge."
"The battery has a 40% charge."

"The battery is at (a) full charge."
"The battery is at (a) 40% charge."
(Neither of these sounds very natural to me.)

"The radio needs a battery with a full charge."
"The radio needs a battery with a 40% charge."

Agree w/fivejedjon but in your last example I don't think a battery would need or I would want a battery with only a 40% charge.