The sign for "battery" is actually the same as the sign for
ELECTRICITY. The meaning is made clear by the rest of your sentence.
ELECTRICITY (or battery)
Use "X" handshapes. Tap together twice.




There is an initialized version of "battery" that uses a "B" hand.
This is a "Signed English" version of battery. I see it being used from
time to time with Deaf kids that use hearing-aids, but I really don't recommend
using this sign.
The "ASL way"
to sign "battery" is to use the sign for electricity.
If you sign "HEARING-AID ELECTRICITY" it is obvious that you are talking about a
"hearing-aid battery." So there usually no real need to ever use
the initialized version of "battery" shown below.
BATTERY: (initialized version) (not recommended)



