Apple plans to increase the RAM in the next-generation iPhone — likely to be dubbed the ‘6s’ — to 2GB, according to AppleInsider. This would provide more working memory to allow for apps to stay open and preserve data in the background, although at a potential battery cost. While Apple has defied expectations thus far in maintaining the iPhone RAM at 1GB in recent years, the iPad Air 2 received a RAM bump to 2GB last year, suggesting…