Bought unit bout 3 to 4 years ago and and put it in my attic, took it out of box last week and let it charge in the open for 3 days and turned it on and it works but it quits working if you stand over it to check the voltage so it appears it is not holding a charge should i open it up and see if i can replace the battery or should i send it in to you to change the battery for me
? Thanks in advance for any advice
Mike Gilliland