Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: how is the battery life and how many battery it use
Document: My inlaws got these for our girls for Christmas, and they love them. They are easy to use, and have a decent range considering we are in a small town. The battery life seems good, they have been playing with them non-stop and the batteries are holding up better than I expected. They can't wait to take them camping with us. They have 22 channels, which helps since there other people on the lower channels when we are out camping.
We have purchased 4 or 5 walkies in the past 12 years. This has benn the best for the price in ease of use, sound quality, and battery life. We Motor Home full time since 2001. We use them to back into RV pads at parks and to stay in touch in regions where there are no cell signals (hiking)  We also clip them on the Grandchildren when we are in State and National parks. Even the 5 year old can use it NO PROBLEM.
Great product but it won't give you anywhere the range you need in an urban area. However, for our needs [in the house and yard], the product works just fine. Battery life is an issue, but I suspect that the same with all of these devices when they are left on constantly.
They don't work as advertised and the battery life too short. They are pretty good at short distance (10ft to 500ft). Don't work at a mile and beyond. Ad claimed 26 miles. standby battery time is less than one day. That gets expensive for battery costs...
Got these for nieces and nephews for Christmas and they were the big hit. My toddler couldnt really figure out how to use but the older kids (5-9) were able to with no problem. They are pretty legit walkie talkies not just for play...many different stations, can go long ranges, etc.
Ease of use and compact for handling and packing! !Recommended for closed or outdoor environments.Easy to program as well.3xAAA battery cells only as preferred.
I bought these for my daughter. They are well built and easy to use. We were able to connect to our other radios as well as hiking partners on a recent trip to Goblin Valley in Utah. I like the way Motorola locks the battery door. It prevents accidental opening and there is no tab to break. There is no privacy sub-channels.
We ordered these two-way radios for our daughter for Christmas. They arrived quickly, but when she opened her present on Christmas morning and tried to use them, one of the units was defective. The battery compartment would not properly hold the batteries. Other units might be fine. I am more disappointed with the company GizmosForLife (through Amazon Market Place) as they were slow to send information about how to return and what they were going to do about it.
One of the units came defective. The battery compartment had something wrong with it so that the battery would not connect properly to allow use. I am disappointed in the company GizmosForLife. They were not helpful in sending much information about how to return the item and if and when we would receive a refund. I ended up paying for my own return shipping and then only after I had sent it, did they respond that they would have paid for return shipping.
Perhaps if you live in rural area where there are many fewer people this is a fine idea.
Answer: Battery life is about as good as the kind of batteries you use (Duracell, Energizer, etc.).  They use three (3) double-A batteries, each, so you'll need a total of six (6).  Buy and use good batteries, and you should have great life as these units don't consume much power when in use.  They DO NOT work 16 miles, as advertised...more like a few blocks, and that's it.