If in doubt about whether an item can be carried onboard check with your airline prior to arriving at the airport. Musical Instruments That Cannot Be Placed in Ordinary Checked Baggage and Must Be Individually Packed for Transportation.

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You cant pack battery banks or laptop chargers than have an inbuilt battery in hold baggage.

What can be packed in checked baggage. You are permitted to bring a total of 70 oz 2 liters of aerosol per person. Liquid aerosol or gel items must be in containers of 100 millilitres volume 100 grams weight or less. Air mattresses with built-in pump are allowed in carry-on bags.
You are able to take medicinal or toiletry aerosols in checked luggage in cans less than 18 oz 500 ml. No general liquid restriction in checked baggage in the USA either. Even though dry shampoo is an aerosol its a toiletry so you are permitted to bring it in your hold luggage.
Smoke and fire incidents involving lithium batteries can be mitigated by the cabin crew and passengers inside the aircraft cabin. Often it just says that liquids that come in containers with a capacity of more than 100 ml should be stowed in checked baggage. The limit is per person not per checked bag so you cant increase your aerosol limit by bringing two checked bags.
They must be carried with the passenger in carry-on baggage. Spare uninstalled lithium metal batteries and lithium ion batteries electronic cigarettes and vaping devices are prohibited in checked baggage. Generally liquid foods can go in checked bags but not in carry-ons although there are exceptions for breast milk and juice for kids.
Loose lithium batteries are prohibited in checked bags. Keep in mind that liquids are heavy and your airline might have a weight limit for your checked bag. Air Mattress with Built-in Pump.
Aerosol insecticides are not allowed in carry-on. Other non-toiltery aerosols are prohibited from checked luggage. Musical instruments may be carried as checked baggage or brought into the cabin to remain in your custody if they meet the requirements for unchecked baggage.
Dry Shampoo In Checked Bags. Anything that has sentimental value and is irreplaceable should never be checked and always packed in hand luggage where you can keep an eye on it. Do not pack valuables essential medication or important documents in your checked baggage.
You can also pack dry shampoo in checked bags. Lithium batteries with more than 100 watt hours may be allowed in carry-on bags with airline approval but. The same goes for your hairspray.
However they are allowed in checked bags as long. And the TSA officers will always have the final decision about what is. Here is the relevant screengrab from the TSA website.
You cant legitimately pack any spare laptop batteries in your hold luggage. Jewelry can be packed in your checked bag but the risk is too high and since jewelry is small it should always be kept in hand luggage. In some cases you may be able to pack the item in your checked baggage.
70 oz is just under 4 x 18 oz cans. If the battery is installed in a device it can be carried in either checked or carry-on baggage. However the total amount of liquid that may be packed in checked baggage is usually left out.
Despite lithium batteries being banned from hold luggage you can put a laptop in a checked bag. Salsa creamy cheese dips peanut butter jam and preserves or other items like these are all okay to put in checked luggage but can only be carried on in containers less than 34 ounces.

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