On 08/02/2018 12:26, Huge wrote:
On 2018-02-08, Huge wrote:
On 2018-02-08, F news@nowhere wrote:
I've SORNed my car as I'm not going to be able to drive it for a couple
of months. No doubt the battery will eventually need a charge but do I
really have to disconnect it as current [pun not intended] advice seems
to indicate?

P.S. re-reading your posting, the reason people suggest disconnecting the
battery is that most modern cars have a substantial current drain even
when switched off (I've measured it at several hundred milliamperes). This
will rapidly flatten and then ruin a car battery. Which is why I use a
float/trickle charger (sometimes called a "battery conditioner").

No. My 'race' car sits for months in the garage with its battery connected
to the car and a 'el cheapo' float charger from eBay. The latter was an
experiment, following the 'el expensivo' float charger (an AirFlow one,
IIRC) that went mad and boiled the lawn mower battery dry. Asking around,
lots of other people recommended other expensive chargers, for prices
that I thought were nonsense (£50+), so I bought 2 of these;

https://www.ebay.co.uk/itm/182929657441

The car's been on one of them for 3 months now, and has been fine. The
other one awaits me buying a new lawn mower battery.



That's exactly what I would have suggested, always assuming you have
mains accessible to the parking place. If not, remove battery and either
leave it on a trickle charger, or on an ordinary one for a few hours
every month or so.