Nintendo Switch Joy-Con AA Battery Pack - Rechargeable Controller Accessories Pair for Nintendo Switch - Perfect for Gaming, Travel, and Long Play Sessions

Ergonomics is great, this is the closest thing to a "pro joycon" nice weight with batteries included gives it a nice heft to hold , works even without batteries if you just like something more ergonomic. Slats slide right in easily , it's got a nice shape design and body. Easy to remove back panel for battery cover. Fully recommend using rechargeable batteries and Secondly having a joy-con dock for maximum usage. This comes in handy for party games , Arms , and games that fully utilize the motion sensors of joycon play. Fully recommend , even though it's kind of old tech by now. Battery life on a full charge with full battery will last me about 5 days of 4-5 hour play sessions. I'd gone a whole 2 weeks without recharging battery or joycons and still had 20% of battery life left or so.