Is there a place to charge your mobile phone or laptop?

Yes, it has a 12V cigarette lighter port that can be used

How to switch from 12V to 24V?

12V and 24V can be switched at any time, simple and convenient.

Does this model have lithium ion or polymer battery

A later question is answered "lead acid" battery. I would believe it's lead acid not Li as everyone says it's VERY heavy. That would be lead acid, I'd guess.

Does it run a 300watt appliance ? if yes how long it can run ?

What "300 watt appliance" are we talking about? First, this pack has no AC inverter if you need household AC power to run this appliance (yet some other models may come with such). So you'll need to connect up your own inverter to this if you wish for it to be the power source. A coffee pot that needs 300 watts (with just heating elements) may be run by an inverter connected to a pack like this as it's power source. If talking about a fridge that normally needs just 100-300 watts, it may not work off most packs. That's because the AC motor has what's called a "surge draw" and can need 1200 watts to get going for 2-3 seconds, but then reduces to the 300 watts or less. I even tried a small fridge off such an inverter rated 400 watts and it just alarmed shutting down. The way to tell "how long will it run" is from the battery amp-hour rating. If you need 300 watts (which is 120V * 2.5 amps), then at 12V power that will be 25 amp draw off the battery. This pack says it has 2 batteries 12V 20 amp/hour rated, so 40 amp/hour total/25amp draw = 1.6 hours at best. Other packs may have only 1 battery about that size cutting the time to under 1 hour. I personally think it's a bad idea to have the draw on a battery so it goes dead in under 1 hour, so to really set up such I'd get a battery that can go for ~2 hours (or bigger if you know you want it to go longer). After such a drain on the battery, you want to recharge ASAP, so don't forget to do that (if you want the battery to last a long time).

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⚡ Power up, pump up, and stay lit—your ultimate roadside sidekick!

INSTANT 1000 A POWER BOOST - Jump-start gas or diesel engines up to 5L with pure copper heavy-duty clamps for maximum conductivity and safety.
MULTI DEVICE CHARGING HUB - Keep your phone, tablet, and car electronics powered via 5V USB and dual 12V DC outlets—perfect for travel and emergencies.
COMPREHENSIVE SAFETY SUITE - Advanced protections against short-circuit, overcharge, reverse polarity, and overheating keep you and your device safe.
RAPID 260 PSI AIR COMPRESSOR - Inflate car tires, bikes, and inflatables in under 5 minutes with 38L/min airflow and 3 versatile nozzles.
ALL WEATHER LED EMERGENCY LIGHT - Bright, long-lasting LED illumination ensures safety and visibility during night-time roadside or camping situations.

The Tyrell Chenergy HH635 is a portable 12V car battery jump starter delivering 1000 peak amps, capable of jump-starting engines up to 5L gas or diesel. It features a built-in 260 PSI air compressor with rapid inflation, dual 12V DC outlets plus a 5V USB port for versatile device charging, and a bright LED emergency light. Designed with multiple safety protections and easy charging options, it’s an all-in-one power station for drivers, campers, and emergency preparedness.

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Manufacturer	Tyrell Chenergy
Brand	Tyrell Chenergy
Model	HH635
Item Weight	10.23 pounds
Package Dimensions	9.84 x 9.57 x 7.32 inches
Item model number	HH635
Batteries	1 12V batteries required. (included)
Manufacturer Part Number	HH635
Amperage	1000 Amps

Car Battery Jump Starter with Air Compressor Portable Tire Inflator,260PSI 1000Amp Battery Booster Jumper Box(Up to 5L Gas or 5L Diesel) Power Station 12V DC Outlet USB Port,LED Light

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