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For the ECO version, that electronic controlled battery charging mode never worked properly on my 2011 Cruze! I replaced 3 batteries and the dealer kept telling me "this behavior is normal". Well... it is not! It is NOT normal that the computer allows to "charge" only 12.2V in certain conditions then recovers at 15+V for short time! For a year and a half now, when I changed the last battery, I disconnected the ring (sensor) from the negative cable. That sensor sends the info to the computer and lets it to "decide" the voltage allowed to recharge the battery. Without it, the alternator is charging most of the time ~14.2V. When it's cold, the charge goes sometimes up to 15.1-15.2 then back under 15. The battery never had an issue since that. I was curious and just measured the voltage. Without driving the car for ~24h, the gauge indicates 12.4V. The car is outside, 8F right now so I think it should be ok.
 
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