I would rather suggest you buying a standard quality of power bank manufactured by the well-known brands. You must check out the best portable chargers from Flux Chargers. I owe this charger and it has given satisfactory results!
There are multiple types of battery chargers. Some simple battery chargers work by giving the battery a constant dose of DC current, others give a pulses of DC current. Among the other types of chargers are trickle chargers, timed chargers, and fast chargers.
Product examples in the miscellaneous electrical industrial apparatus industry include battery chargers, non-electronic condensers, non-electric rectifiers, surge suppressors, and thermoelectric generators
Wireless chargers can be purchased from a lot of places depending on what kind of charger it is. Wether is mobile chargers or laptop chargers. They are sold at most electronic stores and also at some online shops.