NiMH batteries cost less than lithium-ion batteries-batterie Pavilion dv6

Alkaline batteries are non-rechargeable batteries (a recent evening battery ads also repeatedly stressed this point), but they have a very low self-discharge rate and cost (no charger or AC outlet). For low-power applications, alkaline batteries would be a good choice, but to be fair use, quiescent or low sleep current are required.
The design of a common misunderstanding is: only concerned with efficiency, while ignoring the "off" or "sleep" state current consumption, even tens of μA from the battery current consumption can also lead to frequent battery replacement. Now, many design with soft-switch replaces the mechanical switch (mechanical switch can completely disconnect the battery), but this design errors compared to previous years, but more common.
Rechargeable Battery
When the load is too large for alkaline batteries, the need to use rechargeable batteries, which for a laptop, PDA and cell phones and other portable products have become the standard mode. Rechargeable batteries should be as little as possible "disturb" the user, the product has a catalytic role, at least not degrade the performance of the product.

Laptop Akku

laptop battery

There are two choices rechargeable batteries: Nickel-metal hydride batteries or lithium ion batteries. Mobile phone battery charger circuit

NiMH batteries cost less than lithium-ion batteries, while regular usage of the product in terms of insecurity on the battery, this option will become very sensitive. This issue is more important for the lack of low-cost design of complex charging products because NiMH battery is fully charged and fully adapted to the process of discharge. This is often the product will be completely depleted energy more suitable, such as: power tools.
Another application is for NiMH battery replacement alkaline batteries, which removed the battery from the device when the battery runs out of energy, and then to charge the battery from an external charger. This application is relatively common in digital cameras, but requires frequent user intervention.
Many portable products with the above situation is different, PDA, cellular phone needs regular charging, but they are only occasionally consume power. These products are best to use lithium-ion batteries, in addition to weight density, but this battery also has two important advantages: low self-discharge rate, the charge for a short period of time - there is no limit discharges. Consumers do not consider the "Battery Management" issue, simplifying product.

laptop batteries

How to choose the right battery

Design portable devices depends largely on battery performance.
Key indicators of the battery, of course, is the battery life. On the surface, this is just a simple specification, but it involves a number of factors, including: system load (full load current of the power supply time, part of the circuit or microampere current supply time), power efficiency, system power management , battery type and charging.

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In addition to the special importance of the interaction between these characteristics will enhance or diminish the end-user experience. Under normal circumstances, when a user begins to notice the presence of the battery when things get tricky! Good design does not require frequent replacement of batteries (such as a TV remote control), does not require frequent battery charging (electric toothbrush), so that the battery from the front of the user's "disappearance" out. Avoid user devices like functional concerns as concerned the battery.
Select the cell and chemical properties

Mutual restraint between the battery and the system is designed in the often overlooked issue, to ensure the needs of the battery capacity is consistent with the system is critical. Common battery types are: alkaline batteries, nickel metal hydride batteries (NiMH) and lithium ion batteries. They are not interchangeable between the vast majority of products are the best option.
Alkaline batteries