Hello- I have Toyota Matrix 2005 model. My car always had the issue where you don’t drive it for 2-3 days and then the car does not start unless given a jumpstart. Situation has just intensified in covid. 2 days ago I got Harbor Freight’s battery charger/maintenance. It has been 36 hours but it has not charged fully yet (not sure if device is doing its job). However, on disconnecting the cables I was able to start the car right away. But then I let it sit for 6 hours and the battery went down. I immediately plugged the charger back in and it showed 10 V. In 5 minutes it went up to 13.8 V. So it tells me that battery is not able to hold the charge and drains it pretty fast.
Do you guys still battery is dead or is there some another issue? If battery is bad then do you guys recommend traditional battery or AGM? Because of covid, car is not going to be driven often. However, regardless of the battery, I am planning to keep the battery charger hooked up all the times.
Thanks for help in advance.