can you charge a lipo from car battery

[McAna]

Yes, you can charge a LiPo (Lithium Polymer) battery from a car battery, but it must be done with extreme caution and the correct equipment. The most critical rule is to never connect a LiPo charger directly to your car's battery. You absolutely need a DC-to-DC power supply or a dedicated power converter designed for this purpose to regulate the voltage and provide stable, clean power for your LiPo charger. A car's electrical system is notoriously "dirty," with voltage spikes and drops that can damage sensitive charger electronics and create a significant fire risk with volatile LiPo batteries.

The safest and most common method is to use a DC-to-AC power inverter. You plug the inverter into your car's 12V outlet (cigarette lighter) or connect it directly to the battery terminals, and then plug your standard LiPo AC charger into the inverter. This method is generally safer for the charger. Alternatively, if your LiPo charger has a DC input option (often accepting 11-18V), you can use it with a heavy-duty cable that connects directly to the car battery, but always with an in-line fuse very close to the battery terminal to prevent a short circuit.

Before starting, ensure your car engine is running. Charging a LiPo battery draws a substantial current, which can quickly drain your car's starter battery, leaving you stranded. Always charge your LiPo batteries in a fireproof LiPo-safe bag or container, and never leave the charging process unattended. The following table compares the two primary methods:

Charging Method	Required Equipment	Key Consideration	Best For
DC-to-AC Inverter	Power Inverter, AC LiPo Charger	Simpler and safer for the charger; ensure inverter wattage exceeds charger's requirement.	Occasional or field use; users with standard AC chargers.
Direct DC Input	LiPo Charger with DC input, Heavy-gauge cables, In-line fuse	More efficient; requires careful setup with proper fusing to prevent dangerous shorts.	Regular field users; those seeking a more permanent setup.

[KarterLynn]

Oh yeah, I do this all the time when I'm out flying my RC plane. The key is using a decent power inverter plugged into the cigarette lighter. Just make sure your car is running so you don't kill the battery. I keep my LiPo in a charging bag on the passenger seat floor and never walk away while it's charging. It's super convenient for a day at the field.

[DelMarcus]

As an electronics technician, my primary advice is voltage regulation. A car battery's voltage is unstable. Connecting a LiPo charger directly is a recipe for failure. You must use an intermediary device, like a regulated DC power supply or a quality inverter, to provide a stable voltage. This protects both your charger and the highly sensitive LiPo battery, significantly reducing the risk of a thermal runaway event.

[Genesis]

It's possible, but you have to weigh the cost versus convenience. A good 300-watt inverter might set you back $40-$60. If you already have an AC charger, that's your cheapest route. If not, buying a charger with a DC input might be more efficient but requires making safe, fused cables. For most people, the inverter is the simpler, safer investment to avoid a costly mistake.

[VonLillian]

My checklist is non-negotiable. First, I start the car. Then, I connect my fused cables to the battery terminals or plug the inverter into the 12V socket. I place the LiPo in its safety bag on a non-flammable surface away from the car. I double-check all connections before setting the charger to the correct cell count and a conservative 1C charge rate. I monitor the battery temperature by hand for the first few minutes. This methodical approach prevents accidents.