2Pack 5.5Ah P108 Battery Replacement for Ryobi 18V Battery ONE + RB18L50 RB18L40 RB18L25 RB18L15 RB18L13 P103 P104 P105 P107 P102 BPL-1815 BPL-1820G BPL18151 BPL1820

Very reliable

Great for mower gives that longer life which is needed some times, have several batteries of different sizes and all very good . Only point against is if you have small hands difficult to bridge over battery to press the two release catches.