Lithium-Ion Battery for B1 and B1X AirTTL Flash Heads from Profoto will give you up to 325 full-power flashes and thousands of minimum power flashes on a 2.5-hour charge from the 2.8A multi-voltage charger. The 4.5A quick charger shortens that time to 1.5 hours. Fuel-gauge-type LEDs on the battery and both the optional chargers allow you to monitor the charging progress.
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The B1X batteries are fantastic. If I am shooting at a somewhat lower power lever (6-8) these things can go all day.
These are cripplingly expensive. The technology inside is found in other batteries at a fifth of the price. It's hard to justify sticking with Profoto considering the need to replace these on all four of my B1's every few years. I find the recycling time on my older B1 batteries slow making it hard to shoot with them in real world shoot scenarios where you need to shoot fast with consistency.