QUOTE(RicoT @ Jun 12 2019, 03:48 PM)
The sealed lead acid battery still allows gasses to be vented out if it is above a certain pressure, just maybe due to manufacturing defect, or some handling during storage, the vent cap was damaged.
Arc can be formed if there is an electrical potential difference (voltage) across a small gap, in this case, if the internal cells of the battery has some manufacturing defect like damage in the separator or the plates connectors were corroded.
In TS case, the manufacturer will log the incident, check that batch of battery to see if there is any other report. If more reports, means something wrong with that batch and should do recall, else if govt involved, even bigger problem, publicity and pay a hefty fine, compensate a few RM5k to victims and gather reports is better than paying that fine, I think these companies also bought some insurance for cases like this as well.
Thank you mate for that explanation. Seems much easier to understand too, than reading other writings that don't make any sense at all.
At hand now, I have an used Hitachi ES Series. Midtronics test says REPLACE Batt, Measured CCA 149A against Rating 240A. Electrolytes level extremely low.
However the strangest thing is it's showing a reading of 13.04V both on Midtronics & and multimeter, despite being out of vehicle for more than 24 hours already.
Usually the Volt should have dropped with such extremely low electrolytes levels, after all it's been installed since 20 Sept 2017 without any care or maintenance performed.
This battery has only 1 vent at the moment. But will verify this again once I am done testing it.
This post has been edited by Roman Catholic: Jun 12 2019, 04:29 PM