Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I use it to maintain the battery on my convertible through the winter. After putting a new battery in at the end of the season, then ruining it when the car sat all winter, this was the solution.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive