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Introduction to Jump Starter Specifications

Date:2016-03-20 Hits:1244
1. Capacity: Unit - mAh or WH. Each li-polymer jump starter has three battery cells (LiFePO4 type has four). Total capacity = Capacity of single battery cell (mAh) * 3. WH is used as an energy unit, with W meaning Watt and H meaning Hour. KWH means 1000 WH, which means the energy consumed by a KW electronic appliance in one hour.

Conversion between mAh and WH:

Total Capacity (mAh) * Voltage of single battery cell / 1000 = WH
Take CARPOW jump starter model D50 as example: 13600mAh*3.7V/1000=50.32WH

Note: Any lithium polymer battery with more than 100WH is prohibited from carry-on baggage; all lithium polymer batteries are prohibited from check-in baggage.

2. Jump Start Output for Vehicles (EC5 Output): 12V or 24V. Most cars and motorcycles use 12V battery system while most trucks and buses use 24V battery system. Never use 24V output on cars or motorcycles that are 12V battery system. It is highly possible that the car or motorcycle electronic system will get destroyed if someone does this. On the other hand, you can’t jump start a 24V truck or bus with a 12V output but there is usually no safety issue. To confirm the voltage of your vehicle, please read the vehicle user manual or consult with professionals.

3. DC Output: 12V or 16V or 19V. 12V output is for various in-car electronic products such as dust vacuum cleaner and refrigerator. 16V or 19V outputs are primarily for laptops (Used with adaptor). However, it is for emergency use only and can’t be used as long-time power supply. Take CARPOW model D50 as example, it can supply power to laptops only for about 30 minutes.

4. USB Output: 5V 2.1A; 5V 1A. Charge mobile phone, tablets or other 3C electronic products. Charge time depends on the battery capacity of the devices as well as the charging current.

5. DC Input: 15V 1A or 15V 1.5A (Primarily for 24V jump starters). Work with power adaptor or car charger to charge jump starters. Charge time depends on jump starter capacity and the charge current.

6. Micro USB Input:5V 2A (Primarily for small-capacity jump starters). Work with USB car charger or USB power adapter to charge jump starters. Can also use laptop to charge jump starters.

7. Start Current (EC5 Output): Start current varies with capacity and rating of batteries. Its definition is the current the battery can supply continuously under a specific rate.

8. Peak Current (EC5 Output): The highest current jump starters can supply in a very short moment, which varies with battery capacity and rating. Peak current is the current used to jump start vehicle engines. There are two kinds of rating, normal rating and peak rating. General speaking, 30C of normal rating supports 125C of peak rating while 35C supports 150C. Take CARPOW D50 as example, single battery call capacity is 4500mAh and peak rating is 125C; its peak current should be: 4.5*125=560A.

Notes: Rating of battery uses “C” as unit. C is a specific unit used to describe the volume of current when the battery is charging or discharging. 1C discharge means the volume of current used to discharge a full battery to empty in one hour. Take iPhone 6 for example, its battery capacity is 1810mAh and thus its 1C discharging current should be 1.81A; BYD car model e6 uses a battery capacity of 200Ah and thus its 1C discharging current should be 200A.

9. Cycle Life: Depending on materials, cycle life of lithium-polymer batteries can vary from 300 cycles to 3000 cycles. Definition of 500-cycle life is: Use the battery according to the factory standard charge or discharge rate (e.g. 1C discharge and 0.3C charge; charge the battery from 0% to 100% with 0.3C current and discharge the battery from 100% to 0% with 1C current and repeat this); after 500 cycles, the battery capacity decrease to 80% of its original capacity. In reality, cycle life is also related to how you use the battery. e.g.

a. According to factory standard, use the battery in a cycle of 0% to 100% with 1C discharging and 0.3C charging; after 500 cycles, its capacity decreases to 80% of original. (This is the strictest test);

b. Use the battery in a cycle of 25% to 75% with 1C discharging and 0.3C charging, its capacity decreases to 80% of original after 2000 cycles;

c. Use the battery in a cycle of 25% to 75% with 3C discharging and 0.3C charging, its capacity decreases to 80% of original after 1600 cycles;

d. Use the battery in a cycle of 50% to 100% with 1C discharging and 0.3C charging, its capacity decreases to 80% of original after 1800 cycles;

Based on the above examples, we can conclude that it helps extending the battery cycle life by using lower charge or discharge rate as well as avoiding the battery from being full or empty.

10. Working Temperature: For lithium cobalt oxide (LiCoO2) batteries, its applicable working temperature range is -20°C-60°C / -4 °F-140 °F. In some occasions, it can also work outside this range but we don’t recommend that.

11. Size: Varies with product models.

12. Weight: Varies with product models.

13. Packaging Size: Varies with product models.

14. Recommended Vehicle Engine Capacity: Vehicle start current is primarily decided by the starting motor capacity and the loading force during starting. Vehicle engine capacity (e.g. 1L=1000c) is the most important reference point but it cannot be the only factor for consideration. Other factors also have impact on the start current such as fuel type (Gasoline/diesel), engine type and condition, environment (e.g. temperature), if there are other in-car electronics working when starting (e.g. stereo system, air conditioner). Among all these factors, fuel type has the biggest impact as diesel engine is quite different from gasoline engines both in internal structure and operation principles. Start current is usually much higher for diesel engines if compared with same level of gasoline engines, sometimes up to 2-3 times. e.g.

As there are many factors impacting the start current and cars are quite different all over the world, the Recommended Vehicle Engine Capacity is only for reference purpose. Before choosing a jump starter, you are suggested to read the vehicle user manual carefully or consult with professionals to decide what level of jump starters you would need.

Note: Introduction to Lithium Ion Battery Specifications and Application