I completed three packs for a neighbor and myself. These are fairly compact and pack a lot of punch. 16Ahs to be exact. Twice as much as the original Tidalforce hub battery has, to be exact. Yet, the pack weighs about 1/4 of the original Wavecrest front hub battery. These weigh 7.5 lbs whereas the WC front hub battery weighs over 30 lbs with the casing and wheel.