Everything about DC Battery which you need to Know


Everything about DC Battery

  1. Battery vs Cell

  2. Primary vs Secondary

  3. AAAA, AAA, AA, C, D, and F

  4. Laptop and Mobiles

  5. Series & Parallel configuration


Battery vs Cell

  • A cell is known as a single unit device that converts electrical energy to chemical energy,  while a battery is a group of different cells.

  • A cell can be either of wet, dry, fuel or reserve type depending on the kind of electrolytes used, while a battery is either rechargeable or non-rechargeable.

  • Since the cell has only one unit, it is compact and light,  while on the other hand,  the battery has a combination of different cells that increase the battery size and makes it bulkier.

  • The power supply in the cell is for a short period of time, while the power supply in the battery is for a longer duration.

Primary vs Secondary

primary battery is a portable voltaic cell that is not rechargeable.

secondary battery is a portable voltaic cell that is rechargeable.

AAAA, AAA, AA, C, D, and F


Length: 42.5 mm

Diameter: 8.33 mm

Applications: LED Pen Light


Length: 44.5 mm

Diameter: 10.5 mm

Applications: TV remote controls, MP3 players, Cameras


Length: 49.2 – 50.5 mm

Diameter: 13.5 – 14.5 mm


Length: 50 mm

Diameter: 26.2 mm

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Applications: Flash light, Toys


Length: 61.5 mm

Diameter: 33.2 mm

Applications: Large flash light, Radio Receivers, Boom boxes, geiger counters


Length: 91 mm

Diameter: 33 mm

Applications: High current

Laptop and Mobiles

Laptop batteries are typically 3, 4 cell Li-Ion or more recently Li-Poly batteries, whereas smartphone batteries are 1 cell Li-Ion batteries. 1 cell equals roughly 3.7–4.2 Volts. When more cells (of equal amp-hour rating) are connected in series the voltage adds up. Larger devices (laptops) need more voltage, aka more cells. The battery technology is the same though for both laptops and smartphones. LiPoly batteries tend to be able to provide more current at a shorter time period when needed and can occupy less amount of space than their Li-Ion cousins, which results in a higher amount of energy over a volume of space.

Series & Parallel configuration

Series-parallel connection is when you connect a string of batteries to increase both the voltage and capacity of the battery system. For example you can connect six 6V 100Ah batteries together to give you a 24V 200Ah battery, this is achieved by configuring two strings of four batteries.


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