Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Does a charger have to be bought separately or does it come with the battery or with the chainsaw and original battery??
Document: I bought my battery used via the Outdoor Store on Amazon. As much as I like my Earthwise cordless chainsaw, I was getting frustrated by the short run time of the battery.At first I was disappointed with the run time of the new 2.6 amp battery until I realized it wasn't even on the saw.When I actually attached the 2.6 amp battery to the chainsaw, the extra power and longevity of usage were readily apparent.
I bought an Earthwise 18 Volt lithium ion chainsaw which ships with a 1.5 Amp-Hour battery. This is not a professional saw, but all I needed was something for yard work. I really like the saw, but the 1.5 AH battery just doesn't give me enough "saw" time even for light yard work. After a few limbs, the battery needs to be recharged. So, I bought this bigger 2.6 AH battery as a backup.
My only Earthwise device is the 10-Inch Lithium Cordless Electric Chain Saw (which is excellent). Having this additional battery, with it's long life and short charge time, makes the chainsaw a perfect product.
Much improved length of performance, although a little heavier. I use the battery for outside patio's and sidewalks so I have two of these. The housekeeper likes the original smaller battery pack and usually has smaller, clean up jobs around the house.
This 2.6 AH battery is bigger than the original 1.5 AH battery that came with the saw. It is the same width, but about a half inch taller. So, if you buy the saw, unless you are only cutting a couple of limbs, you might as well buy this extra battery. You will need it.
Bought a second one just in case I run out of charge and haven't finished the lawn. Needless to say that was a good plan. Seems to hold the charge well.
Had no problems... holds a good charge, as well as the original one. Note to self, do not leave in garage over the winter!
While it would fit into the hedge trimmer, it had a bump on the charging end that would not allow it to fit into the charger. I had to go directly to the manufacturer who sold me one that worked for about 80% of your price. Will be real suspicious about using Amazon again.
I love the battery. It really extended the use time of my leaf blower. I would definitely recommend this product.
Lithium Ion is the way to go. Battery was delivered promptly, charges quickly and can't say how long it lasts because.so far it has outlasted me.
Answer: yes