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

Input:
Question: How long is the battery life?
Document: Video quality is excellent and everything works perfectly for the first six months, with the exception of the battery life of 30 minutes. Now for the problems. This camera has a very, very cheap build quality and the interchangeable battery started falling out 6 months after purchasing it. I have had it now for nearly 9 months and SD Card slot keeps getting stuck. Unless you need a temporary camera do not buy.
So far, no speed issues to report. As others mentioned, battery life is not great. You'll get 40 minutes of footage at best, which is just enough for me to film the kids here and there, but not for major excursions. Lower the video quality if you need more battery life, otherwise plan on buying another battery.The shake reduction works well, and makes for nice smooth footage. The huge 40x zoom is smooth and easy to run slow and steady.
Bought this to take video at Christmas. Relatively intuitive to use. About 30 minutes of battery life. Good video and sound quality while watching it on the attached screen. Trying to download the video is when the nightmare began. I have a Lenovo Thinkpad. Unlike my 8-yr-old Sony camcorder, you could not simply download the files. You had to install their proprietary software which never worked properly. It kept locking up my computer and after 2 hours, I gave up and tried my MacBook.
Image stabilization is horrible and it takes to long to initiate once the door is opened. I do not recommend.
Play time with the kids,..Videos are by far the best way to capture the monent you will never see again for the future to see, also take pictures from the best on you videos,..Thank you for reading my review enjoy your life now,.. take care now,..Use it to make videos to help sale your stuff on ebay!... works for me,...
Great camera. We took it on a trip to DisneyWorld and did not have any issues. We did buy an extra battery and charged them overnight.
Its a cool camera but it comes with nothing you have to buy another battery and bag and memory card so be prepared to spend more then you want to lol
meaning the screen must be on the entire time you are recording. this is a terrible waste of power and is one of the reasons the supplied battery only lasts about 20 minutes. i am returning the product. i can not work around this major flaw.
The Camcorder is very less weighted.I would also recommend to get additional battery if in case we need to shoot more. Other recommendation would be to use a bigger SDHC/SDXC card to record more.We are really loving this camera.
Nice little lightweight camera. Must buy extended battery. Good quality pictures. However, if you break it, be prepared for the most rude and expensive scam in town. Only one place to service in Texas, and they'll rip  you off! Minimum $160.95 charge!
Answer: 20 minutes or so...I use a USB battery bank, it plugs in the charger and charges your battery and powers your camera, all these type of small HD units come with a small battery, and they try to sale you a special battery for a lot of money, but you can use a USB power bank, its a USB universal lithium battery pack, that last for hours, most come with the plug to fit your unit, or just buy one that fits your unit and you can use any USB plug to power your camera for hours.This is what I did or do. Also use a 32GB High Speed SD card, make sure you get the high speed for HD. Also a tri pod to hold your camera for the best filming results.