filament battery

16 LETTERS · STARTS WITH F

filament battery is a valid 16-letter word worth 25 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1L1A1M3E1N1T1B3A1T1T1E1R1Y4
4 + 1 + 1 + 1 + 3 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 4 =25 PTS
DOUBLE WORD → 50TRIPLE WORD → 75
MEANING

What does filament battery mean?

1