thought i’d drop in a few thoughts:
When it comes to batteries i agree with Scott, the eachine stock 240mAh is a wonderful battery. BUT: Got hooked on the Crazepony 230mAh HV batteries - those are night and day difference to the stock batteries. (using a standard 4.2V charger - eFlite Celectra) Hovering at 40% throttle…
But i would not blame chargers too much. If they don’t fry your batteries with too high charge rates and have a clean top cut off voltage IMHO you can use anthing to charge. I used the orange usb stick too for the stock eachine 240mAh and it did wonderful everytime. (Even though my ShineyWhoop got lost in a corn field for 1 hour - camera sucked it down to 2.12V!)
Using cheap chargers just make sure your lipo takes not much less than 30mins to charge an check the voltage after charging. You have 4.15 to 4.20 volts you are pretty fine.
But, WrighZilla, if your batteries get puffy too fast, did u check the voltage after flying?