Our efforts

Alternative Battery,
Received the batteries yesterday.

The Twinhead battery looked & tested ok.

The Acer battery casing is a little loose & was not glued back properly but the battery is working. So not problem there.

Overall, satisfied with the fast service & quality.

Pls quote for cell replacement for HP battery model HSTNN-DB13 11.1v 4400mAH.

Regards
Customer


Alternative Battery

Thank you for your assuring word.

I notice when my Centrino processor run at half speed the battery bar shows more then 4 hours @ 90%. Full speed 3.30 hours @ 90%.

I am glad that I send the battery to you instead of buying a new one from the net. I will definitely introduce you to my customer if they are looking to repack their battery.

Thanks

Customer

Morning,

Last night plug in the new refill battery into my vaio notebook.

Battery display shows it can last 2:30hr....

pull out the power adaptor socket and let the notebook run in battery mode.

most of the time i browse internet and reading emails.

after 2 hours of usage the battery display shows balance 30% battery life.

Your battery performance same par as the original battery pack from sony.

good job done.

Feel very satisfied and fast respond.

in near future would like to ask you refill my canon S60 battery pack NB-2LH 720 mAh lithium ion type.

can it possible be done?

Customer

Above is some emails reply by some of the most recent customers, Alternative Battery Enterprise is happy that we able to satisfy our customers need, not all customers can be satisfied, but we shall try our best to give what we able to.

We deliver quality work so that:
1. The battery housing is subjected to minimum or even not blemishing mark.
2. Before you send to repair, it working. After we repair it work like new instead of stop working.
3. The work is very tidy, all cells is arrange neatly just as before, seal at all possible conducted electrode.

Problem of one of my customer

One of my customer report that my battery is under spec as his original battery can give him 2:30hr standby time while my battery only give him approx 2 hours, At first I think that it was my cells problem since my cells is rated at higher spec than his, suppose to do better than his original.


Then I try to charge and discharge my cells, at first it work fine as state in their example curve, but at the end of discharge, it drop down faster than it should and record a >2260mAH for a cell discharge at 2A take approximately 80 minutes from 4.2V to 3.0V, Samsung suggest discharge to 2.75V. This mean if combining 2 pieces it still have at least 4500mAH suppose to work better than his original battery. Note that Samsung don't sell 2300mAH battery, if I discharge it to 2.75V there suppose have 23++mAH, so they label it 2400mAH, will be 4800mAH on most notebook battery pack.

There is however it isn't, I have come out with 2 assumption:
1. Sony rated 4400mAH work better than 4400mAH.
2. Samsung built in PTC (Positive Temperature Coefficient) thermistor have higher resistance than Sony, thus result in battery pack have higher voltage drop across PTC, this assumption was made base on I trust my supplier cells since they always do so. And the cells have thicker isolator among electrode, result in higher cells resistance than Sony but it is safer to practicing this.

Higher voltage drop across PTC result in faster false triggering of Near End (~7%) or end of discharge (0%) voltage reach (So battery board fell that cells is empty even there may be still around 10-20%) .

At different current flow, higher current will have more voltage drop across PTC, resulting in EDV shift to lower to allow correct power meter, EDV various base on the preset value defined by the specified setting in a particular pack.

Newest battery IC with built in impedance tracker will track the impedance of cells for different battery, reduce the need for technical people to set the value for fine tune according to different type of chemical. Example is bq20Z70/Z80/Z90 family, but it is still expansive so rarely a factory want it, only big company adapt it to reduce the complexity and time for implementation/production of a battery for a system.

So this few weeks I shall study how the manufacturer set EDV for Samsung Cells compare to Sony cells. I will do some experiments to prove this since hard to get all the spec for those industry cells.

Sorry for my incompatible for this issue since this is first time I use Samsung cells, along the years I seen minimum case of leakage ever occur on Samsung cells and Sony cells, but Sony have some no so good history record so I decided to go for Samsung which seen safer. No to look down on Sony cells, it is powerful and they perhaps have making their lesson over the years.

Learn a lesson here, sorry my customer. I believe this will not occur on notebook battery that originally using Samsung cells, which I will contact another customer who originally cell is Samsung to verify this.

P/S：Sony EDV0 is 3050mV, will track back Samsung from my old file. EDV1 and EDV2 is checking now hope will get conclusion soon. There are more than two version of bq2084, most commonly use is v133 and v143 which have different dataflash format. I am really sorry as I am not the best technical. I suggest those who want to do refill battery, learn properly, some battery is easy to refill but some make people headache.

Update(27June): Base on EDV Discharge Rate and Temperature Compensation Programming in manufacturer's manual, I found that EDV is calculate base on

EDV0,1,2 = n (EMF * FBL – |ILOAD| * R0 * FTZ)

Update(2July): Finally I get back the battery and I check what happening, strange enough, I didn't found any problem occur on the battery, it register a capacity of 4667mAH after a few cycle use, although it didn't reach 4800mAH, but at least it won't let you down. As I know, all brands of cells is sell in this way, they sell the cells base on closer capacity, example 2330 will be rate as 2400mAH but not 2200mAH. 2200mAH usually it will only have 2100+mAH nominal capacity. Even I discharge the battery, it will still do more that 4700mAH in 3Ampere discharge current. Now I am start to think, Sony label some very high capacity cells example 5200+mAH cells and sale it at spec 4400mAH to the manufacturer, to show that their battery is strong or because the market demand it but in their stock is all high capacity, so they remark it to lower capacity.

In fact, mAH is just a reference, many people don't know that high power cells that can continuously supply more current (a few time more) than normal cells, if discharged in low current, can supply more WHr even it discharged at same amount of mAH, that is why some people prefer using unit WHr than mAH. But high power cells is more dangerous in my point of view, some high power cells can supply more than 10A continuously, if short circuit occur inside the cells (dielectric is too thin, more tend to be punctured by crystal built up inside the cells), can result in explosion.

This is similar to processor manufacturer produce many low frequency processor because market demand on it is higher, it doesn't mean that the processor is slow. So it can be over clock to higher speed. Example some 1.6GHz can over clock to 2.0GHz without rising it voltage. When they speak about global huge market, they want cash flow rather that store the stock since electronic products going to become obsolete very fast.

All trademark is belong to their owner, this technical document is post for learning purpose only.

Notebook battery cells arrived

New battery cells arrive! Those Samsung (Made in Korea) cells is manufactured 2008 with code number 844, newest Samsung Li-ion chemical formula reversion E. Litium ion cells have a maximum 3 years cells life in notebook even though it is not been used.

Please note that all the information below is not from internet but the true capacity tested by our equipment.

Rated Capacity: 2400mAH/4800mAH
Real capacity: ~2346mAH/4692mAH
Real Energy Stored: ~8.4WHr per cell (multiply by number of cell) -example 8.4*6=50WHr in 6 cells battery pack, 67.2WHr in 8 cells battery.
Energy Density including battery container: ~175WHr/KG

Test Condition:
Discharge at constant current 2A (~1C) from 4.2V down to 3.0V
Charge at constant current 1A (~1/2C) up to 4.2V.


x-axis, ~165mAH or 5 minutes per unit.
y-axis, 50mV per unit.

Note 1: Good cells usually "n-turned" at around 3.4V. Poor cells may "n-turned" at around 3V to 3.3V. The lower is the "n-turn", the less power it going to deliver. Some people use WHr to represent the real power. Take average of voltage along the curve and multiply with mAH, you will get Whr.

Note 2: Good cells usually have rise back Voltage at around 3.3V after fully discharge to 3.0V. Poor cells will have rise back to more than 3.5V, resulting in less charging capacity after discharge, which will reach 4.2V very fast.

Note 3: Good cells will have same characteristic curve for all cells. This is very important because different characteristic curve when mix up, can shorter the overall life of a battery pack.

http://alternative-battery.blogspot.com/2008/06/notebook-battery-cells-arrived.html

This post is copyrighted by this site. If you want to use any information from this site, please copy also the reference, thanks.

RCPC

RCPC is a sensor device come with decode/action software that, allowing use of the remote controller of your TV or VCD/DVD player to control your window application, for example Power DVD, Window media player, real player and etch.

RCPC allow you to pause/stop/forward/reverse the playing progress, it can also be used to abjust the volume of PC and even shut down your PC, with just a key press on your remote control! This is good if you have a PC in your bedroom.

Price is RM30 now! Please mail to mail.altbattery@gmail.com (with title: RCPC inquiry) to purchase or inquiry. Beside, also selling remote controller of your TV/DVD players, just specified the model number (of remote and TV) and I will check if stock available, RM15-20 each remote controller. All prices including shipping within Malaysia.

The configuration dialog of RCPC:

Running video is direct draw on graphic pipe so can not be captured, thus it is black in color. Text OSD(On Screen Display) is green in color, it only appear when you press increase/decrease volume or changing profile.

System requirements:
-One working COM port.
-While PCPC working fine on all PC, but to get the best remote control experiences, CPU faster than 500MHz is recommended.
-Window 98/XP is installed.