The Joyless Cons have 20 hour battery life, the Switch tablet is like 3-6 hours run time and the joyless cons will charge when connect to tablet and docked. So you have mess up at least three tablet charge cycles and forget to connect them before they will run dead. If you have a second set of joyless cons maybe a grip charger or charger stand makes a little sense but still it isn't really necessary until you get like 3 or 4 sets of the joyless wonders to each Switch you have. If you can afford that then the charger is a drop in the blood bucket.
Just take care of your expensive shit and you will be fine.
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Maybe they will make us pay the whole year up front or maybe like iCloud they will just charge my PayPal account $2 a month. Not sure, but if it doesn't work out just cancel or just call and bitch and they will probably give you a refund. Most any business that operates a service in the US will because they don't want you causing a shitstorm on social media over small change. It's not worth it to them.
On top of that if you pay with a credit card or PayPal you can file a charge back or file a dispute. It's not worth their time to fight a $30 charge, they would rather just part ways.