On 11/04/2020 09:53, Mike Clarke wrote:
On 10/04/2020 22:35, The Natural Philosopher wrote:
On 10/04/2020 20:28, Bert Coules wrote:

Â* Do I need to disconnect the car's own connecting leads
first?

no

Some manufacturers recommend that you do disconnect the battery. Some
cheapo chargers might have a very spiky voltage pattern that could upset
the onboard electronics.

You need a hell of a lot of current to spike a battery over 14v

Always connect the charger to the battery before switching on the mains
and switch off before disconnecting to avoid sparks at the terminals.
Especially after charging when there could be a build up of hydrogen
around the battery.


--
€œThe fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

- Bertrand Russell