Comparing our batteries with other batteries

Comparing our batteries with other batteries

A different kind of battery in our MP4 – with Polymer Lithium battery.

Left - Li-polymer battery (MP4 from Hobby Unlimited Int’l)
Right - Regular Li-ion battery (provided by other companies)

All our MP4 comes with a high quality,  full size Li-Polymer battery, which ensures longer fun time and less hassle.

So what is a Lithium-ion polymer battery?

Lithium-ion polymer (Li-Polymer) batteries use lithium as an active ingredient. The lithium in these batteries isn’t packed into cells as it is in lithium ion batteries. Instead, it is contained in a polymer solid composite gel. They utilize this gelled electrolyte to increase conductance.
What is the advantage of using Li-poly batteries over Lithium ion batteries (Li-Ion)?

  1. Lower cost manufacturing and being more robust to physical damage. In addition, they utilize a dry polymer which enables them to be manufactured in a greater variety of shapes and sizes than Li-Ion batteries.

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  2. Unlike Li-ion, having a rigid metal case, polymer cells have a flexible, foil-type (polymer laminate) case, but they still contain organic solvent. The main difference between commercial Li-Poly and Li-Ion cells is that in the latter the rigid case presses the electrodes and the separator onto each other, whereas in polymer cells this external pressure is not required because the electrode sheets and the separator sheets are laminated onto each other. Since no metal battery cell casing is needed, the battery can be lighter and it can be specifically shaped to fit the device it will power. Because of the denser packaging without intercell spacing between cylindrical cells and the lack of metal casing, the energy density of Li-poly batteries is over 20% higher than that of a classical Li-ion battery and they store more energy than nickel-cadmium (NiCd) and nickel metal hydride (NiMH) batteries of the same volume.

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  3. Li-polymer battery has a greater life cycle degradation rate. However, in recent years, manufacturers have been declaring upwards of 500 charge-discharge cycles before the capacity drops to 80% (see Sanyo).

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  4. They have excellent Charge/discharge cycle characteristics, plus no memory effect after repetitive cycles, with self-discharge less than 10% per month.

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  5. They process a wide discharging temperature range of -20 °C to +60 °C, can maintain comparatively high performance no matter where our customers locate.

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  6. With all the above great profiles, they can still be the size of a regular credit card, due to the gelled electrolytes, which enables simplified packaging by eliminating the metal shell.

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  7. With all the above excellent safety characteristics, more resistant to overcharge, and less chance of electroyte leakage.

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To recharge the cell, please keep it charge for at least 3 hours, up to 8 hours at a maximum, you should be able to enjoy 2 hours of music.  

I bring it to work on my way to work, every day the commute takes about an hour to my office and an hour back.  I can watch predownloaded videos while I am waiting in the subway… this is especially good when there are too many people in the train and I have to just stand up in a corner… whenever reading newspaper became impossible.  This little gadget just fits in my palm, became my companion to work :)