12 Volt battery woes – Part 1


Two weekends in a row I had to get a jump-start from the Allianz roadside assist.  Either the less-than-1-year-old battery is on its last legs or the something is quickly draining the battery.

Unfortunately it is not easy to analyse the battery using the otherwise sophisticated piece of kit because it isn’t easy to rev or idle in a Prius.  The results of the test were inconclusive.  The Prius does not have an alternator to charge the battery, it uses the HV battery to do that with the HV battery in turn being charged by the small Motor/Generator (MG1).  So the fact that the battery is charging when the car is running doesn’t tell you anything.

So, out to Battery World at Phillip for a battery check and to discuss options.  Their testing suggested that the battery was in very good shape.  So rather than buy a new Optima Yellow Top for $385, I purchased a spiffy CTEK MXS 5.0 battery charger and because the battery is tucked away a bit, I bought a delightfully-named Comfort Indicator Eyelet M6.  Once again Scandinavia comes to the rescue.

The CTEK MXS 5.0 has 4 programs and 8 phases to cover small, large and almost dead batteries.  There’s a special setting for very cold conditions, which I might have to use in Winter.

CTEK MXS 5.0 battery charger.  Does your battery charger have that many lights?  Didn’t think so.

Since the charging current doesn’t get above 4 amps on the normal program, I could charge the battery in-situ without worrying about creating gas or excessive heat.

Since access to the battery terminals involves the removal of several panels, the Comfort Indicator socket provides easy access and it’s traffic light system shows when the battery is at 100%-80%, 80%-40% or below 40% charge.

CTEK Comfort Connector with indicator
CTEK Comfort Connector with indicator and masking tape solution.  I can see the flashing light through the back window, even with the tonneau cover on

So, before I need to use the car, I check the indicator.  If it’s red, I charge the battery.

Now to find what’s draining the battery…

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