Since the onset of the High-Voltage revolution in 2016 we've known that the better we treat our batteries, the longer they'll serve us. Although we sell the best Tiny Whoop batteries in the world (made by MyLipo), leaving any battery at high voltage or full charge for a long period of time is probably the primary killer of Tiny Whoop batteries. Any pro miniquad or Tiny Whoop pilot will tell you - store your batteries at a storage charge, not fully charged nor completely empty.
That's why we developed the Tiny Whoop 1S discharger - If you charge a bunch of packs for a flight session or a race and you don't end up flying them all, pop one of these babies on and let it slowley discharge your battery back to a safe storage charge. Over the course of a couple hours it will bleed your battery down to 3.79-3.80v, then enter a very, very slow trickle discharge that would take years.
These dischargers also function as a quick battery checker - when you plug the discharger on to your battery if the blue light stays solid for a moment, your battery voltage is over 4.15v and you're ready to fly! Or just leave it plugged in to the battery and watch the blue LED enter a breathing pattern until it reaches 3.8v, at which time the LED will turn off.
This discharger only works with batteries with the PW/JST2.0 connector.
Never, ever charge or discharge any Lipo battery unattended. Always closely monitor all charging and discharging batteries.