Is this a true drop-in replacement for a Group 24 lead-acid battery?

It fits Group 24 trays and terminals, but check that your charger has a lithium or LiFePO4 profile. Lead-acid charging profiles can leave it undercharged.

What does the Bluetooth feature let me do?

It shows state of charge, voltage and cell-level data in a phone app. The app is basic and the connection can drop, so treat it as a convenience rather than a precision instrument.

Can I charge it in freezing weather?

Low-temperature protection blocks charging below freezing to protect the cells. It does not warm the battery, so you need to bring it above freezing before charging.

How does it compare with a 100Ah lead-acid battery?

It weighs much less and gives more usable capacity, since LiFePO4 can be discharged deeper without damage. It also lasts more cycles, which matters for RV and solar use.

Can I use several of these in parallel?

Parallel connection is common for building a larger bank, but match them by age and state of charge and follow the manufacturer's wiring guidance.

What is included with the battery?

The battery itself with its built-in battery management system. Check the listing for terminal hardware and any charger, which are usually sold separately.