Need help with my batteries

[MasteroftheVape]

It gets harder to charge lithium the more charged they are. The 500ma chargers might get the battery from 0 to 50% in 2 hours but it will take another 2 hours for 50-70 and 2 more hours for 70-90 and 2 more hours for 90-100.

As with almost everything China makes its overrated as well. That 500ma charger is realistically 300 ma so it might not have the ability to fully charge a cell. Just enough power to keep it level at 80% or so and dissipate all the energy as heat.
Cheap chargers kill batteries.

Get an anker power station and call it a day. Charges my 10000ma phone battery in 2 hours flat.

 

[Bored2Tears]

and in the end i used my dads charger which charged them just fine.

Pamelac, as I stated earlier....I think you just needed an ego style charger with a longer contact end. Your comment seems to confirm this. Your Dad's charger is probably slightly longer and making contact to your deep well X6. Most likely you could swap one of yours with his. As was mentioned you might also have been using a slower charger which would take longer.