Quote:
Originally Posted by Charger
Also, in the competition, I saw teams charging their batteries just in 30 min. How is it possible? It takes us about 2 hours to charge just one battery properly. And is there any way to use 1 charger to charge more than 1 battery?
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Without more information, it is not possible to say whether the team you saw really "charged their batteries in just 30 minutes". If their batteries were only slightly discharged, topping them up would not take very long. A charger with a very high charging current would charge the battery very quickly but is not legal and would most likely damage the battery.
If you are asking if it is possible to use one LEGAL battery charger to charge several batteries connected in parallel, the answer is a qualified yes. The state of charge of the batteries being connected in parallel will not be the same. Often, teams use batteries from different manufacturers so the internal resistances will be somewhat different. Putting a random mix of batteries in parallel and connecting them to one current source (not a multi-output charger) will mean that the charging current for each battery will be different and the charging time for each battery to reach full charge will be different. If the charger used is a trickle charger, the currents will be low enough that the battery can be left charging at that current for a long time without significant damage so eventually, after a long time, all the batteries will reach full charge, one after another. If the charger is not a trickle charger, it is possible that some of the batteries become overcharged, damaging them permanently.