For our trip we used 15Ah batteries on our Kalkhoffs which lasted us for about 50 miles. We had a spare battery for the four days we did over 50 miles. We stayed overnight in a mixture of B&Bs, hotels and pubs so charging was no problem. We carried a reasonable toolkit and spares for punctures etc but were fortunate not to need to use any of them; this despite some fairly rough surfaces on canal towpaths and the like. Waterproof gear took up quite a bit of space. Other than that it was a few clothes, battery charger, phone charger, camera and maps. Although we thought we didn't take much it still weighed quite a bit.