I just got my new mower, Fastrak 20/52 and I want to put an hour meter in. The meter from the dealer is $40, I can buy an after-market digital meter for somewhat less but I'm wondering, do these meters lose their memory if I take the battery out during the winter for storage? I can get a mechanical meter for significantly less, it wont lose count but it doesn't fit in the factory knock-out. What do you think??