lithium battery pack  which were, in contrast to previous laptops, the approximate size of an A4 paper sheet.[1] Either term is often used improperly: due to heat and other issues, many laptops are inappropriate for use on one's lap, and most are not the size of an A4 sheet. Although, some older portable computers, such as the Macintosh Portable and certain Zenith TurbosPort models,

lithium battery pack were sometimes described as "laptops", their size and weight were too great for this category.
　　Laptops usually run on a single battery or from an external

lithium battery pack AC/DC adapter which can charge the battery while also supplying power to the computer itself.
　　 lithium battery pack As personal computers, laptops are capable of the same tasks as a desktop PC, although they are typically less powerful for the same price. They contain components that are similar to their desktop counterparts and perform the same functions, but are miniaturized and optimized for mobile use and efficient power consumption. lithium battery pack Laptops usually have liquid crystal displays and most of them use different memory modules for their RAM (for instance, SO-DIMM in lieu of the larger DIMMs). In addition to a built-in keyboard, they may utilize a touchpad (also known as a trackpad) or a pointing stick for input, though an external keyboard or mouse can usually be attached.

1) lithium battery pack Maintenance scope
No.    Components name    Service term(month)    Maintenance scope
1    frame, forint fork and handlebar warranty     24    sealing-off or rupture
2    motor warranty    24    Lithium battery packcheck the detailed rules in remark
3    Controller warranty    12    controlling fail or instability
4    Lithium battery pack warranty        Invalidation or capability lower than 60%
5    charger warranty    12    cannot work
6    kickstand，rim，back seat warranty    3    rupture
7    brake warranty    3    Unwonted noise or failure
8    Shoe warranty    3    rupture
9    flywheel warranty    6    rupture
10    bicycle saddle     3    rupture
2）Lithium battery packNot included in after service and maintenance
No.    Item    Content    disposal
1    Do not follow the user manual to use, maintain and adjust        Charge for different situation
2    Improper using or keeping, contretemps
3    Refitting or repairing by owner         Charge for repair
4    Breaking down by owner    Lithium battery packProblems cannot by identified or analyzed because the original problem state has been broken    Charge for different situation
5    Dismantling by owner    incorrect operations which is not included in user manual
6    Secondary malfunction     Continually use in malfunction state
7    The fee that repaired by others     Problems caused by incorrect operations or repairs and rebu