The electric bike I have has a 48v , 15.4ah battery. <br><br>The charger for the bike reads a 120v-240v ac input , with a 2a output.<br> The portable powerbank I am looking at is here,  https://www.amazon.com/dp/B06Y3NF7N2/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B06Y3NF7N2&pd_rd_wg=xjXEP&pd_rd_r=RPT4RMBVXEH370Z8P1AQ&pd_rd_w=vuzsq<br>42k mah capacity with 250w/110v output
<br>Would this be sufficient in charging this battery? <br><Br>Also if I were to keep the powerbank charging the battery in a bike mount , while the bike was in operation, would that cause any problems? 
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Below are pictures of the battery and the weight. It's a dinosaur.<br>[![enter image description here][1]][1]<br>[![enter image description here][2]][2]<br>[![enter image description here][3]][3]<br>That is 12lbs. <br>(I bought the bike from a previous owner who seems to have shorted the battery , because the bike does not seem to go as far as I would like it to , and the battery charges very fast , which lead me to the idea of a portable charger.)


  [1]: https://i.sstatic.net/mzfOH.jpg
  [2]: https://i.sstatic.net/ij6w9.jpg
  [3]: https://i.sstatic.net/kFTl8.jpg