Hi,
How could I (or we) recommend an IC or a solution?
What information do we have? 48V battery. That's it.
No chemistry, no current, no capacity, no features, no accuracy, no interface, no timing....no price, no volume, no package informations...
Farnell lists more than 1000 ICs in the category "battery management".
About 250 ICs for "fuel gauge" and "monitoring".
No one of us knows
* what you need
* all the datasheet details of the available ICs
Thus distributors as well as IC manufacturers help you to find the "best" IC for you....and every one.
They provide online selection guides. Professionals use them. They are for free, so hobbyists may use them, too.
I think there is no better and no faster way for you to find what you need.
And in case you find 50 "suitable" ICs: lucky you, don't be afraid, just choose the one out of mood, maybe the one with lowest cost.
Read datasheets. Every IC manufacturer provides additional informations like application notes, design notes, calculators, design examples, evaluation boards, software... All for you, all information usually for free.
Search the internet for information from those IC users. Sometimes they talk about problems and experienc, show their hardware design, show their software..
Just a couple of decades ago when I started to design electronics there was no internet.
Can you imagine what huge benefit the internet gives? So use it.
Klaus