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Good idea? Connecting 12V 22Ah battery to the cigarette lighter socket

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YOUR RESEARCHGood idea? Connecting 12V 22Ah battery to the cigarette lighter socket

Leading reported evidence

Disconnect negative terminal first

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Suggestion

NOTE: disconnect the negative terminal first and reconnect it last.

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Good idea? Connecting 12V 22Ah battery to the cigarette lighter socket
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Leading evidence: 'Disconnect negative terminal first' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect negative terminal first' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Disconnect negative terminal first

No successful repair reported for this finding.

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Reported fixes
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Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion

NOTE: disconnect the negative terminal first and reconnect it last.

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Good idea? Connecting 12V 22Ah battery to the cigarette lighter socket
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

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Generation: 20261027T020439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

996 is parked at a garage with no electricity sockets. So, I cannot hook up a battery maintener/conditioner directly to the car. Currently, I have Bosch S5, 74Ah battery installed. As Porsche's cigarette lighter socket is "hot," could I simply hook up a 12V 22ah maintenance-free battery to a 996's cigarette lighter socket so that my car's battery will not run flat for about 1 month's time. I figure the additional 12V 22ah capacity could help the main battery a bit. What I have in mind is a Yuasa 12V 22ah lead acid battery which is light and compact (about 7inch x 3inch x 6.6inch). What do you think? Are there any safety issues I should be concerned?

POST 2Original post

The problem here is the battery source output would not be modulated as a trickle charger would be. Plugging in a simple 9V battery to the lighter socket supposedly will help the ECU retain settings and the radio to save the activate codes in the event of a discharged battery. But the amperage output in this case would be very, very low. My recommendation...remove the battery and take it inside where you can connect a trickle charger. NOTE: disconnect the negative terminal first and reconnect it last. relinuca

POST 4Original post

Can you park near the office where an extension cord might reach to an outlet there?

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