Here is a concise summary of the provided transcript:
**Title:** Troubleshooting a Dead Car Battery with DIY Jump-Starting
**Summary:**
* The author's car battery dies frequently, and they attempt to jump-start it using various DIY methods.
* Initial attempts with a "super cap" (charged to 14V) and a "puny battery" (12V) fail due to the car battery's extremely low voltage (0.7V).
* After multiple tries, the author succeeds in jump-starting the car using a drill battery (1203 Mary) in series with the "puny battery", raising the voltage to 15-16V.
* The car starts, and the battery begins to recharge.
* Investigation reveals that a likely cause of the dead battery was leaving an interior light on for an extended period (measured current draw: ~0.8A).
* The author reflects on the importance of turning off all car lights to prevent battery drain.
**Outcome:** The car is successfully jump-started, and the battery recharges, but potential permanent damage is acknowledged.
Here are the key facts extracted from the text, keeping each fact a short sentence, numbered for reference:
**Warning: Some facts may imply a sequence of events, but opinions and speculative language have been excluded.**
1. The car's battery had been killed (drained) multiple times, requiring repeated boosts.
2. The car's battery was completely discharged, with no lights or functions working.
3. The initial battery voltage reading was approximately 0.7 volts.
4. A "super cap" (supercapacitor) was charged to around 14 volts for potential use.
5. An extra 12-volt battery was used in attempts to boost the car.
6. Connecting the extra battery raised the car's battery voltage to 12 volts immediately.
7. The alligator clip wires used for connections were damaged and burned during the process.
8. After multiple attempts, the car was eventually jump-started using a modified setup.
9. To achieve a successful jump-start, a drill battery (Mary) was used in series with another battery to raise the voltage to 15-16 volts.
10. The car was run for 15 minutes to test if the battery would recharge.
11. Initially, it was doubted that the car battery would recharge, suggesting potential permanent damage.
12. Despite doubts, the car battery did recharge enough to restart the car after being run for a while.
13. The cause of the deep discharge was investigated, suspecting a possible leak or current draw when the car was off.
14. Baseline current draw from the battery when the car was off was measured at approximately 0.3-0.4 amps.
15. Unlocking the car resulted in a current draw of zero amps, indicating the previous measurement was related to the car's state.
16. Turning on one of the car's ceiling lights drew approximately 0.8 amps of current, explaining the rapid discharge.
17. It was concluded that leaving the lights on for an extended period (couple of days without driving) likely caused the deep battery discharge.