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

Input:
Question: Will this battery work in my DMC-ZS20 camera and is it a good replacement for the original battery that came with the camera?
Document: I do not know what all the fuss is about in previous reviews. I bought this battery as a backup. It is *identical* to the original battery that came with my Panasonic  DMC-ZS5 camera. I tried it in the camera. The camera recognizes it with no problems and works perfectly. If you need an exact replacement for your original battery, this battery is what you want.
When I originally bought the camera (Panasonic DMC-ZS-10) it came with one battery. I have had some good non-original batteries in the past that have given great service. BUT, this time it surprised me. The older non-EOM battery worked fine for about 2 years of normal use, then something happened.I had charged up the batteries for our trip to Hawaii. We went with friends to the Pali Highway and up to the Outlook Vista. It was fantastically beautiful.
I bought this at the same time I bought the actualy DMC-ZS7 camera as a replacement in case I go somewhere and I run out of battery life. I read the reviews and was scared about ordering it, so I got it from Amazon directly so I knew I could return it if it came down to that.I was happy and surprised to find it identical when it arrived.
This often hard to find battery is the OEM version as purchased from reseller Good As New Electronics. Camera is Panasonic Lumix DMC-ZS5 version 1.0 firmware. Batteries charged,tested & work fine. Battery itself from my initial use (camera is less than 2 months old) has lasted for 'my particular use' on average about 125 photos from full charge doing mostly outdoor landscape, exclusively manual setting, minimal use of flash, max resolution, LCD on, usually reviewing each photo.
Don't be fooled by some of the other reviews from other businesses claiming to have the original oem replacement battery. Good As New Electronics has the original oem that is required to be recognized and used by the Panasonic lumix dmc-s7 cameras. Thanks Good As New Electronics, I appreciate the great battery.
I want to share my experience since some have questioned whether these batteries really work. The battery I received seems to be exactly what came with my ZS7 camera and was exactly as pictured here. DMW-BCG10PP Panasonic battery. It seems to work just like the original and I have no reason to doubt that it is legit.
There seemed to be some debate on whether this was the right battery for the Lumix DS7 from all the reviews I read. I purchased this from Good as New electronics and it is exactly the same as the battery that came with the camera, and the picture is accurate. Panasonic explains in the camera manual that knock off batteries will not work in their cameras ( can cause overheating etc ) and the camera checks the battery.
Purchased this battery as spare for my DMC-ZS20 camera and took about 3Hrs or so to fully charge. Have not used it in camera yet to know what the battery life is yet before it needs a re-charge.
Contacted Good As New Electronics and they assured me that the battery they had was the one as pictured. DMW-BCG10PP  is on the battery that came with my DMC ZR1 camera and is the same as the description (DMW-BCG10 ID Secured Battery). Panasonic site showed the same description. Came in new and exactly the battery I needed. I always look at the negative reviews to see if there is a pattern in the complaints.
I ordered this battery for the Panasonic Lumix DMC-ZS7 camera I also just ordered. Ordered the battery from Agent Frugal. Received it a week before the camera came. Now that I have the camera I can tell you that it is the correct battery for this model. I've read other posts that say they received the wrong battery when ordering from other companies. I had good luck with Agent Frugal.
Answer: The battery will work well,I have the same camera.