Cold start issue

[vinny121]

Hey all,
My 165K Yaris doesn't want to start. When I turn the key, all I get is clicks, the engine doesn't make any noise. The 3yr old battery seems to be fine; it has 12.2 V. I checked OBD for codes and found none. Would anyone have any ideas on how to fix? Thanks for your help.
https://www.youtube.com/watch?v=3oRswndBVbM

[WeeYari]

If you haven't already done so, clean and reseat the battery terminals.

[alanwagen]

12.2 volts is low. You need to load test the battery. I think it's the battery.

[vinny121]

I remove and cleaned the terminals with a steel wire brush then reseat them with dielectric grease. There was rust on the cabling and the terminal bolts but I think know the connections are now good. When I turned the key on, I noticed that the starter was turning the engine for a few secs but I didn't hear any ignition. Then the second time, I tried key on, I heard just 5 rapid clicks and the engine wont turn over. Thanks for the suggestions.

I connected jumper cables (https://www.hessertoyota.com/blog/how-to-jumpstart-a-toyota-yaris/) to it and then the yaris started fine. I think the issue was the rusty corroded battery terminals not allowing the alternator to charge the battery, I did a test drive and the yaris seemed to function normally. I tested with multi-meter and it has load voltage (ie headlights on) of 8.0V. I'll have to check the battery to see if the battery maintains 12.6 volts (https://www.autozone.com/diy/battery/how-to-test-a-car-battery-with-a-multimeter).