I fly the
Inspire 2, and DJI either by happenstance or design made the
I2 batteries rated to 97.58wh. TSA limits the capacity to 100wh for rechargeable lithium, with an additional 2 batteries allowed from 101-160wh. There doesn't seem to be a quantity limit with the 100wh variety as long as it's for use by the passenger.
As this doesn't affect me, our camera batteries can exceed both those limitations. Fortunately, we have a large crew so we split up the hi cap batts.
I pasted the text from the TSA below for reference. Hope it helps, and of course if someone has a different opinion, please share.
Size limits: Lithium metal (non-rechargeable) batteries are limited to 2 grams of lithium per battery. Lithium ion (rechargeable) batteries are limited to a rating of 100 watt hours (Wh) per battery. These limits allow for nearly all types of lithium batteries used by the average person in their electronic devices. With airline approval, passengers may also carry up to two spare larger lithium ion batteries (101-160 watt hours). This size covers the larger after-market extended-life laptop computer batteries and some larger batteries used in professional audio/visual equipment.
Quantity limits: None for most batteries – but batteries must be for use by the passenger. Batteries carried for further sale or distribution (vendor samples, etc.) are prohibited. There is a limit of two spare batteries per person for the larger lithium ion batteries described above (101-160 watt hours per battery).
Batteries must be protected from damage.
Battery terminals (usually the ends) must be protected from short circuit (i.e., the terminals must not come in contact with other metal). Methods include: leaving the batteries in their retail packaging, covering battery terminals with tape, using a battery case, using a battery sleeve in a camera bag, or putting them snugly in a plastic bag or protective pouch.