Using battery trickle charger over winter

My CTEC is stuck on my garage wall, brought an extension cable for it so it connects to the battery in the boot and I close it properly to its all alarmed.
 
PerryGunn said:
Same as Taz, CTEK charger in boot connected directly to battery, mains cable running out under boot lid.

Car is garaged and locked but with the boot lid down but not latched - I don't think the alarm activates until both doors and the boot are shut/latched

I do this, but i set the boot as "latched", i.e. lock set, whilst still open, but then shut the boot lid without latching it. System thinks the boot is locked shut, but is only locked. No compression of the cable at all.

BTW, I also put a dehumidifier in the boot and main cabin - non electrical ones - to soak up any moisture. An easy home-made one is to use some cat litter and old socks (pour the cat litter into one sock, then place into the other sock). Replace the cat litter every couple of weeks, or just dry it out on a radiator for a couple of hours.
 
Mines in the garage and unlocked - the charger is connected to the posts under the bonnet which is left cracked open.
I use a cheapo golf cart type charger and it cycles the battery.
 
markeg said:
BTW, I also put a dehumidifier in the boot and main cabin - non electrical ones - to soak up any moisture. An easy home-made one is to use some cat litter and old socks (pour the cat litter into one sock, then place into the other sock). Replace the cat litter every couple of weeks, or just dry it out on a radiator for a couple of hours.

Old sock filled with cat litter drying on the radiator, ah the glamour of premium German sports car ownership :lol:
 
I use a CTEC over the winter and connect direct to the battery terminals in the boot. I leave a rear quarter light fractionally open and run the cable in through that and then down into the boot, Works for me I have left the car both locked and unlocked it doesn't seem to make any difference.
 
Has anybody used a standard battery charger and just put it on a timer pkug to charge for 1hr a day ?
Would that cause any issues ?
 
Number5 said:
Has anybody used a standard battery charger and just put it on a timer pkug to charge for 1hr a day ?
Would that cause any issues ?

That would probably be OK at a low rate but not at full whack which could result in plate damage. The latest ctek smart chargers 'read' the charge state and adjust charge rates, apparently a normal charge-up will only take a battery to 80% or so although it will indicate 100%. You can try it, when you leave a freshly charged battery for a few hours the charge dissipates away from the plates in to the liquid/gel and will then accept more charge giving the impression it has discharged a bit, but this is normal. The ctek reads this and feeds more in as and when. Secondly some ctek use a pulse discharge/charge cycle to help de-sulphur plates effectively restoring them (sulphation is caused by allowing a battery to become discharged).

The battery in my car is now 13 years old and still good, probably as a result of the ctek - but I'm probably tempting fate :P
 
Ewazix said:
Number5 said:
Has anybody used a standard battery charger and just put it on a timer pkug to charge for 1hr a day ?
Would that cause any issues ?

That would probably be OK at a low rate but not at full whack which could result in plate damage. The latest ctek smart chargers 'read' the charge state and adjust charge rates, apparently a normal charge-up will only take a battery to 80% or so although it will indicate 100%. You can try it, when you leave a freshly charged battery for a few hours the charge dissipates away from the plates in to the liquid/gel and will then accept more charge giving the impression it has discharged a bit, but this is normal. The ctek reads this and feeds more in as and when. Secondly some ctek use a pulse discharge/charge cycle to help de-sulphur plates effectively restoring them (sulphation is caused by allowing a battery to become discharged).

The battery in my car is now 13 years old and still good, probably as a result of the ctek - but I'm probably tempting fate :P

Cheers. my charger reads it as it has a 4 stage LEd indicator, it also says it trickles once fully charged, but its not a CTEC.
 
Number5 said:
Ewazix said:
Number5 said:
Has anybody used a standard battery charger and just put it on a timer pkug to charge for 1hr a day ?
Would that cause any issues ?

That would probably be OK at a low rate but not at full whack which could result in plate damage. The latest ctek smart chargers 'read' the charge state and adjust charge rates, apparently a normal charge-up will only take a battery to 80% or so although it will indicate 100%. You can try it, when you leave a freshly charged battery for a few hours the charge dissipates away from the plates in to the liquid/gel and will then accept more charge giving the impression it has discharged a bit, but this is normal. The ctek reads this and feeds more in as and when. Secondly some ctek use a pulse discharge/charge cycle to help de-sulphur plates effectively restoring them (sulphation is caused by allowing a battery to become discharged).

The battery in my car is now 13 years old and still good, probably as a result of the ctek - but I'm probably tempting fate :P

Cheers. my charger reads it as it has a 4 stage LEd indicator, it also says it trickles once fully charged, but its not a CTEC.

Sounds like the same sort of kit, ctek actually make the charges for a lot of big brands plus BMW, Merc etc etc. But with a top-end ctek costing the same as a decent battery with a 5 year warranty it's a questionable cost/benefit in some ways TBH.
 
Novice question
I have a Z4 E89 and want to use a trickle charger using the positive point in the engine bay. Where do people connect the negative clip to.
Cheers
 
Mop1 said:
Novice question
I have a Z4 E89 and want to use a trickle charger using the positive point in the engine bay. Where do people connect the negative clip to.
Cheers

Any exposed bit of metal should do the job...it should all be earthed.

there are some large nuts on top of the diagonal strut braces that are in a handy spot.
 
Zen Baron, thanks for the photo which is really helpful.
Now I have located the negative terminal I realise the distance between the pos/neg clips on the Ctek charger I have brought is too short :headbang:
 
I note many of you extend the mains cable and then worry about something going wrong like cut cable. I extend the12v lead. Safer and cheaper. Use 2 core white and you won't forget it's there either. :thumbsup:
 
I Picked up a solar charger a couple of weeks ago when my old battery bit the dust. No cables to worry about :thumbsup: no good inside of course :lol:
 
Silverzedtom said:
Busterboo said:
If only the cigarette lighter socket were live!

There’s always the OBD port, or feeding a cable through the firewall.
They are on BMWs.

There's always the cable CTEK supply that attaches to the battery and gives a convenient socket to connect to in the boot.
 
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