The problem with the chargers and battery packs is that they generally run in 2s2p and dont have a balance charger. which makes them not only dangerous but not last very long. At that point it becomes easier to just get the p25 and a bike mount, or something else that has modes suitable for biking/edc.
edit: you might also want to have a look at the review for the convoy l4 i believe that would give some good competition to the p25. Link