Baseball's the most popular sport in Japan, so it's no mystery to see several baseball anime/manga making their way around~
Oofuri is a lot more fluffy than Battery, as the main in Battery is abused by his team mates, and is constantly told that he's not good enough. Oofuri has nearly all the characters telling him that he can do it.
besides from both being baseball animes, the mc in both of them seem to have this type of personality where they are good on what they do but still miss something important about baseball wich is to love it..... then their relationship with other people slowly make them change and enjoy what they do
Baseball Sports anime where characters are trying to overcome others and further their own skills in the process. Slice of elements are similar as both have a visable progression with their characters.
Plot in both focuses on baseball.
Another similarity is that younger brother is doing his best to play baseball as good as the older brother.
Not everything goes as planned.
Characters are trying to overcome their own limits.
Both are about people playing baseball, while the Major series focuses on the MC's entire life, they're both about pitchers that are the best in their league. Catchers in both series also struggle to catch the pitches sometimes.
Elementary school kids (and very old people) are more or less given free reign to so whatever they please in society, but not so for others. Battery and Wandering Son are about the children who are facing that fact in a restrictive and largely socially conservative Japan, all whilst taking their first step into puberty and middle school life.
Despite the difference and the fact that Battery on the surface seems to be about baseball, both are actually keenly observant shows about kids learning about what society expects of them, developing their identities, and figuring how to fit that into what others expect of them. Finding autonomy amidst calls of 'listen to your parents', 'listen to your coach', 'respect people older than you', 'go to cram school', 'we're doing this for your good, for your future!', 'you're too young to understand.'
The character designs are very similar (both by Shimura Takako), and the characters in both have a tendency to act older than their age; but that adds nicely to the immersive atmosphere, I mean, didn't we all think we were that eloquent/serious/aware at the time?
Battery revolves around baseball, but Wandering Son is more clearly focused on identify, revolving around a group queer/questioning kids as individuals outside of any specific club activities. The drama and colour palette are also much heavier in Battery compared to a lighter, and more bittersweet Wandering Son, character flaws are not assessed as critically in Wandering Son as a result.  read more
Both are from the same studo, based on light novels from the last decade, which were also both adapted into two very obscure manga.
I may be wrong but I think they're actually from the same author.
Both have HEAVY AMOUNTS OF UNNCECESSARY DRAMA, and are ultimately utterly boring.
- Set in a small village in the country side, with lots of nice details of country life and different accents/dialects (Okayama for Battery and Gotou islands for Barakamon).
- Prickly and ill-mannered, but ultimately talented protagonist (Barakamon details the events directly after such a person's fall from grace, whereas Battery is about the start of their pursuing their activity of choice).
- Small child actually voice by a small child!
Barakamon is a warm, fuzzy, feel-good sort of show with plenty of funny and cute moments despite the drama; whereas Battery is very heavy and makes for uncomfortable viewing at times because it doesn't gloss over flaws. The unlikable parts of a characters personality is clearly framed as ugly in Battery, as oppose to a cute little quirk that can be laughed off as in other shows.
The two shows have a similarly chilled backdrop, with a similar feeling in background art; but the atmosphere is as different as the topic (calligraphy vs. baseball). read more