how to make a backup recharable battery using 8 aa batteries? to give output 9 volt?


battery backup
asked:


how to make a backup recharable battery using 8 aa batteries? to give output 9 volt?
i want to use it to my wireless router(tp-link) because the electricity cut sometimes and i dint want to lose my connection
any help ?
i have 8 AA batteries(rechargeable) 1,2 volt each,any circuit diagram? pls help
router need:0.8A
i have a battery (series circuit)
each one 2000mah

This entry was posted on Monday, December 28th, 2009 at 12:00 am and is filed under Other - Electronics. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

5 Responses to “how to make a backup recharable battery using 8 aa batteries? to give output 9 volt?”

  1. TV guy Says:
    December 28th, 2009 at 4:50 pm

    And why don’t you just buy a 9V battery?
    Actually you may need more than one, because a single battery, may not provide enough power.

    Back to the original question. 6 1.5V batteries in series will give you 9 V, but I doubt you will have enough current to power a router. TV guy

  2. James Says:
    December 30th, 2009 at 11:17 pm

    connect batteries in series, you can go to electronic hobby stores and buy battery packs for this.

    You would have to buy some sort of low-power relay to switch power to the batteries when the power is out.

    The backup wouldn’t last very long, but it does have a high enough amperage. James

  3. classicsat Says:
    January 2nd, 2010 at 11:11 am

    Just hook them in series.

    Personally, I’f get a 12V gel cell and charger, and run the router/modem off of that, if not an actual UPS. classicsat

  4. poorbillgates Says:
    January 4th, 2010 at 4:18 am

    .
    Boy it is impossible because series battery cannot be charged, but i can give you 2 alternate ideas
    .
    when you connect the 8 batt
    erys in series the Voltage is increased that is 1.2 x 8 but the current is same
    .
    when the batterys are charged the charger circuit takes the battery as if a 9V 2000 ma battery is connected. so all the battery want get charged. so how can u use it.
    .
    i think there is no 9v rechargeable battery iam not sure, but u can use a 12V1.5A battery just simply add a 3 volt bulb inbetween.
    .
    the simple way is just use computer UPS which will give you a good back ( microtec double backup )
    .

    .
    THANKYOU
    .
    VOTE FOR THE BEST
    . poorbillgates

  5. ►BobB◄ Says:
    January 6th, 2010 at 9:24 am

    just buy an 8 cell battery pack. Load the plastic carrier with the NiMH or NiCd batteries.

    This will give you 9.6v

    9.6v is fine for your router. I you feel that you must drop the .6v, put a silicon diode in series with the pack. That will give you 8.9v

    The router has an internal voltage regulator. It is quite normal to feed the router with 9V but the router actually uses 5V.

    You cannot “just use a 9v battery” if you need 800ma.
    The battery pack has no problem recharging with batteries in series (I wonder what he was smoking at the time).

    Here is what I did….
    All of my network devices are now 5volt. I built a 5A 5V power supply, and all of my hubs, routers, wifi hardware, are now powered by the 5v supply. No more wall warts! and when the power fails, the big UPS powers the 5V supply…. the 5v supply is actually just a regulator off the batteries inthe UPS. ►BobB◄

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