Something like this

Tenergy TB6-B Balance Charger Discharger 1S-6S Digital Battery Pack Charger for NiMH/NiCD/Li-PO/Li-Fe Packs w/ LCD Display Hobby Battery Charger w/ Tamiya/JST/EC3/HiTec/Deans Connectors + Power Supply https://www.amazon.com/dp/B00466PKE0/ref=cm_sw_r_cp_apa_i_S-S6DbCWG7HBQ

With that battery you suggested

Power supplies for chargers are a pain in the ass.

I started with this combo: here

But I also had to buy charging cables for batteries with the XT60 connector like this.

Buying all the components separately is probably cheaper tho.

The discharge rate is based on a minimum, you're fine to exceed this rating.

I watched this video about a year ago and it definitely has some good advice. https://youtu.be/lQtKgiv70DQ

Biggest take-aways are : - Get a LiPo charger with balance and storage mode - ALWAYS balance charge - Store in a fireproof bag - Store at 3.8v per cell

This is the charger I use for single battery charging: https://www.amazon.com/dp/B00466PKE0/ref=cm_sw_r_cp_apa_fabc_bOb2Fb6W3PKQQ

At the moment this is a very good price, it normally bounces around between 60-70$ on Amazon. I actually bought an extra as a spare.