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  1. young707

    battery backup for modem

    no battery? http://www.ebay.com/itm/DC-UPS-60W-12V-EU-Uninterruptible-power-supply-for-Router-CCTV-VoIP-NAS-IoT-/222506476435 What's SLA?
  2. young707

    battery backup for modem

    I mean how to charge this battery with car cigarette lighter plug? http://www.ebay.com/itm/DC-UPS-60W-12V-EU-Uninterruptible-power-supply-for-Router-CCTV-VoIP-NAS-IoT-/222506476435
  3. young707

    battery backup for modem

    I do not recommend to run car to power DSL/Cable modem / router with wifi and ethernet. this car jumper is 8000 mAh / 400A for $32 https://www.amazon.com/gp/product/B0713T64TJ/ref=ox_sc_act_title_2?smid=A2VT4H683M5NNA&psc=1 this mini DC gets 15600 mAh for $45.39...
  4. young707

    battery backup for modem

    12V booster packs or jumper packs: are you talking about 1500 peak amps, 360 cranking amps, to jump start cars? That's hundred of dollars of juice. For nearly 10 years, I use a 24VDC electric lawn mower. It has two 12V small battery in series. It works well in around up 40 to 50 recharge cycles...
  5. young707

    battery backup for modem

    Well, there are laptops and there are laptops. Microsoft Surface 3 is only 13W, recharge with USB, good for 9 hours. Sorry, no huge massive big screen i7 jobs. We are minimalist. A $20 12VDC rechargeable lead acid battery at 7 Amp is 84W. Otherwise, get another battery stand by and swap in...
  6. young707

    battery backup for modem

    Thank you for all your helpful replies. Still searching for off the shelf or easy to modify and assemble solutions When our power went out caused by storms and triple digit super hot days, we desperately want to 1. Recharge the cell phones, tablets and laptops – 5V USB 2. Power the cable/DSL...
  7. young707

    battery backup for modem

    yes, I would rather buy a off-the-shelf item. but, if needed, I am willing to do some assembling, may be a markatable project and sell on Amazon? Any comments?
  8. young707

    battery backup for modem

    thank you for your quick replies. Yes, similar, but no need for "uninterruptible". These are industrial grade UPS for office operation, quite expensive units. just home use for 12VDC battery power the modem and recharge cell phones & tablets. > have connection for low cost 12VDC lead acid...
  9. young707

    battery backup for modem

    I am seeking battery backup for modem (DSL & cable) for 12VDC 3Amp. Is there readily available consumer grade 12VDC battery systems so that we can power our modem and recharge our cell phones/tablets when power goes our? Otherwise, what is the circuit available to regulate & current limiting...
  10. young707

    Charging Nickel Metal Hydride batteries in series

    This circuit have 5 Nickel Metal Hydride batteries in series to power LED lights. To recharge, the 5 serially connected batteries is connect to a +12VDC 5A wall plug adapter power supply. This circuit works for a little while in the beginning. Then, It stop working. Can you please tell me why...
  11. young707

    how to measure leakage current of NiMH battery?

    Yes, we already have same model using disposable Alkaline batteries. The model I am working on are rechargeable models. I use a simple Fluke hand-held multimeter scale of 300mA. But did not see any leakage current. I am searching for ammeter with 10-6 scale. Is there any way to remedy this 5x...
  12. young707

    how to measure leakage current of NiMH battery?

    Thank you. We need to make very precision conductive measurement for a open reed relay circuit. We want to determine the openned relay may cause current leakage for 2 years storage of serially connected 5 AA NiMH batteries. That is why we seek the mininal resistive load in series to the...
  13. young707

    how to measure leakage current of NiMH battery?

    I have a 5x NiMH AA battery in series to power a bunch of LED. The open & close circuit switch is a reed relay. I want to measure the current flow value when the relay is open and close. How best to draw the discharge rate chart after the relay is closed? I assume the current is very low when...

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