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Re: Min eis an HP 11C. flashing 0.00
It may have latched up internally; I would try removing the batteries for at least a day, two would be better.
The CMOS circuitry used is extremely high resistance (low power drain, evidenced by the long battery life) and there may be circuits which did not 'drain' down during the battery swap.
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If the unit will work while in the charger, it is most likely the battery has reached the end of its useful life. If this is the original battery, you are quite fortunate it has lasted this long and have taken good care of it because these batteries seldom last more than a two or three years before needing replacement.
Try this first. Take out the batteries. Now take a paper clip and bend it into a "U" shape. In the well where the batteries go touch one end of the paper clip to one battery terminal while touching the other end of the paper clip to the other battery terminal. Hold it like this for 30 seconds or so. This effectively dumps any residual charge from the calculator. Now, reinstall the batteries and try turning it on. Assuming this doesn't work I'm afraid you're in the market for a new calculator. HP no longer repairs these so your best bet will be to replace it with the HP35s. The 11c can be found on ebay but they are extremely expensive. Good luck
Generally laptop batteries (Lithium-Ion) come in standard 6-cell and 12-cell configurations, lasting about 1.5 to 2 years before they begin to degrade in their charge capacity.
HP has issued 3 recalls in the last two years regarding laptop batteries, and you can check to see if your laptop qualifies for their replacement program under the recall at: http://bpr.hpordercenter.com/hbpr/
You can also shop Nextag for laptop batteries that are compatible with the dv600z, here are some search results: http://www.google.com/products?hl=en&q=laptop+battery+for+hp+dv6000z&um=1&ie=UTF-8&ei=EqgtSuvxF4_SNOvR7PcJ&sa=X&oi=product_result_group&resnum=1&ct=title
Lastly, if you purchased the laptop at Best Buy for instance, and you purchased the GSBTP (geek squad black tie protection) which is just their in-store warranty, they all come with a free battery replacement for the term of the warranty.
I had the same problem with my HP 11C. The following solution worked for me.
1. Remove the battery cover.
2. With the batteries in place (i.e. DO NO REMOVE THEM), use a small piece of wire (I used a standard staple bent at one end), short the terminals FOR A BRIEF MOMENT between both ends of the set of batteries (the HP-11C has three). This means somehow inserting the staple such that the contacts in the batteries receptacle are shorted.
3. The flashing will stop. Then push the ON button until the calculator turns on. If it does not work the first time, remove the batteries and resinsert them.
4. You may have to repeat this procedure. I had to do it twice before my calculator worked again.
When you buy your watch the manufacture puts in a battery that is made to last 5 years so that the watch can sit on the shelf and not need the battery changed before you have even bought it. Batteries you buy from a store or a watchrepair usually last about 1.5 years. Sometimes you can find a watchmaker who carries the five year batteries, but most people don't want to pay the $25-$30 to have it installed so most places won't carry them for rear they will never sell.I would also tell you NOT to buy your batteries from a grocery store or a Wallgreens type place because those batteries could have been sitting there for months, or even over a year. If you go to a watch repair they go through so many batteries that almost evey time you are getting a fresh battery.