Which trickle charger? 911 997

[JapanRed]

Hi all,

I've had the 911 2 years now and for the first 21 months never had battery issues (battery was replaced when I bought it). However twice since Christmas the car has failed to start after not being driven for 3 weeks each time. I assume this is normal and there's not an issue?

I'm going to have to buy a trickle charger but don't know which one. I've read that CTEK are the best but which model is required for my 997 C4S?

Thanks in advance.

[Magic919]

You can take your pick, but CTEK MXS 5.0 is popular.

Sounds like the battery is not the best. I'd be fine after three weeks.

[anonymous-user]

I use a ctek mxs5.0 on my 997.2.

When the battery was replaced, the opc fitted the charging adapter onto the battery terminals.

[LordHaveMurci]

Mxs5.0 on my 996, been using it 2+ years now.

[Maxym]

When I had a 997 I used to drive it at least once a week and if it was going to be parked longer than much over that I hooked it up to a CTEK. No starting problems with that regime.

[sidicks]

Magic919 said:

You can take your pick, but CTEK MXS 5.0 is popular.

Sounds like the battery is not the best. I'd be fine after three weeks.

Just bought this exact charger - works well for my GT3.

[JapanRed]

Thanks guys. I'll get the CTEK5.0 as recommended.

Battery is only 2 years old. Surely it shouldnt be failing already? It's a Bosch fitted by a well know Porsche indy.

[sidicks]

JapanRed said:

Thanks guys. I'll get the CTEK5.0 as recommended.

Battery is only 2 years old. Surely it shouldnt be failing already? It's a Bosch fitted by a well know Porsche indy.

It's not unknown...

Get the trickle charger and you should have no further problems!

[JapanRed]

Thanks again guys. Any ideas how long the trickle charger will take to charge it enough to start? Considering it's dead as a dodo with key stuck in ignition (now removed) etc.

[Magic919]

Letting a lead acid battery run low is a good way to shorten its life.

You'll need to charge until the battery reaches sufficient voltage (about 12.5). This will be limited by the size of the charger, 5 amps in the case of the CTEK above. A more powerful charger can do the job faster.

It might start after about 5-6 hours, but make sure you fully charge it.

If you think you would like to be able to charge more quickly, buy a bigger charger. I use an MXS 10.

[JapanRed]

Thanks guys. Is the MCS5 limited to certain size engines? I might be buying the old shape C63 next month (keeping the Porsche). Would the MXS5 still be ok if I ever needed to charge the 6.2?

[Magic919]

No, they grade them like that so idiots can work out which one to buy.

[blueSL]

The CTEC chargers do a good job nursing a completely flat battery back to life. I inadvertently left the car without trickle charging over winter which meant it was completely flat. The CTEC brought it back to life but I agree it's important to let it charge the battery completely.

The car now starts easily but not with quite the same vigour as a new battery which makes me think it's not long for this world, so I carry a starter pack with me just in case.

[JapanRed]

Thanks guys. I ordered one which should be delivered today. Hopefully be back in the car soon.

[JapanRed]

Just to update this thread. I got a CTEK5.0 and it's perfect for the job. Just run the leads through the gap in the top of the bonnet.

Thanks for the advice.