Which Christmas Gifts should i choose?

Christmas Day is around the corner, i want buy a xmas gifts for my friend. He enjoy films , playing games and take photos, but i alway hear he to complain with the short work time of the laptop battery , i think whether i could buy a laptop battery or digital picture frame to him for the christmas gifts. I'm confused which one should i choose? Who can give me some suggestion?

Replacement Power Battery for HP F4809A,Battery Pack for HP F4809A Notebook Computer

HP F4809A Laptop Battery which compatible with compaq 319411-001,
compaq 4098a, compaq 916-2150, Laptop Batteries are on sell by
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Lithium battery composition

Different types of lithium battery materials used by the size of different sizes, of the following is a column-lithium manganese battery CR123A components:
Cathode covered
Uplift in the top part of the battery, and internal cathode connected, logo battery cathode.

Battery Shell
The nickel plating steel shell battery, battery role is to guarantee the internal active substances not direct contact with the outside world, and it connected with the anode, the negative electrode sets flow from the role.

Battery labeling
A set of plastic packaging printing, the type of batteries used for identification and models and other information.

Divide
An anode active material is separated and maintaining electro-hydraulic materials.

Electrolyte
In a lithium manganese ion batteries used to transfer the organic electrolyte lithium perchlorate.

Cathode
In a lithium-manganese batteries, cathode material is manganese dioxide.

Anode
In a lithium-manganese batteries, the lithium anode material.

Can dell 1691p laptop battery fit for dell inspiron2500 ?

Dell 1691p laptop battery:

Features:

Battery Type :Li-ion

Voltage :14.80V ( Compatible with 14.4V )

Capacity :3600mAh

Color :Dark Grey

Dimension :138.50x90.00x21.00mm

Net Weight :510.29 g

Fit models: dell

inspiron2500	3700
3800	4000
4100	4150
8000	8100
8200	latitudec
c500	c510
c540	c600
c610	c640
c800	c810
c840	cp
cpi	cpia
cpia	cpia300st
cpia366st	cpia366xt
cpia400xt	cpic
cpic333gt	cpid
cpid	cpir
cpir	cpir400gt
cpm	cpm
cpm166st	cpm233st
cpm233xt	cpt

Lithium ion battery Features

The weight light, the battery capacity ratio big, Electric discharge slight (1%/ day), the charge efficiency high (charge input capacity nearly was equal tobattery output capacity), the non- memory effect, does not need the maintenance electric discharge, the monomer voltage reaches 3.7V(3.6V), the cycle-index may reach 300-1K, have the rapid charge rateability, the high temperature flashover characteristic is outstanding.

How to extend the battery life for laptop?

Question:

My laptop computer battery now can only normally work 20 minutes, what means has to be allowed to let the notebook computer battery extend its life?

Answer:

Introduced one kind of simple battery capacity the restoration method , first cramp out the notebook computer the exchange power supply plug, namely with the battery to the notebook computer power supply, after and so on the system prompt "the electric quantity is insufficient" the warning, takes out the battery from the notebook computer, discovers the battery with the avonmeter the positive and negative two-pole, with small light or electricity nichrome wire to battery discharge, until the electric quantity exhausts, then return the battery in the notebook computer to charge. After so circulates several times, may restore the battery some capacities.

Question about laptop battery

Question:

My notebook uses the alternating current in the belt battery situation, the duty fence demonstrates is charging. Asked by now the notebook consumed the electricity was comes from the battery or the alternating current? When the battery fills 100%, by now the duty fence demonstrated uses the alternating current. Asked by now the notebook used was the battery electricity or the alternating current electricity?

Answer:

When your notebook belt battery uses on the other hand, this time ison the one hand charges by the city electricity power supply, the notebook consumes the electricity completely to come from to the alternating current. When the battery fills 100%, so long as the duty fence demonstrates uses the alternating current, then this time writes down originally can stop charging, also completely uses the alternating current to supply power. Needs to remind you is, if the long time does not use the battery, suggested takes down the battery, this regarding lengthens the life to be of great advantage. Surely do not have frequently to carry on the charge to the battery, because the lithium ion battery also has the life limit.