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Thread: Battery Packs VS Single Batteries

  1. #1
    Unenlightened
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    Sssh Battery Packs VS Single Batteries

    Hello to all,

    Im new here, thanks for having me. Ive got a couple of questions on batteries used in cordless landline phones. Been to other sites asking but no one can really answer me as everyone seems to be either in the AT&T is better camp or Panasonic is better camp with no explanations.

    Im shopping for a new phone system, my present 10+ year old phone is a Uniden (no batt backup), that uses a Ni-Cad battery ‘pack’ its also 10+ years old, I haven’t had to replace that battery “pack”. I can talk for 3+ hours without having to recharge it, Ive forgotten to replace it in its charger for a couple of days and I can still pick it up and talk for 3 hours. An instruction on these new phones for the first time charging is, single batts are 7 hours, battery packs is 10 hours. On my 10+ yr old phone the Ni-Cads-battery pack, had to charge for 10 hours for its first charge.


    Both pack and singles have the same amp/mah rating. So what is the difference between the battery pack and the single batteries, besides the battery pack has 2 wires that plug directly into the phone? Does plugging the battery directly into the handset make a difference?

    I look forward to you sage advice. Thanks very much. Sunny

  2. #2
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    Default Re: Battery Packs VS Single Batteries

    Hello and welcome to CPF

    Your thread has been approved, but was moved to the appropriate subforum, Non-Flashlight Electronics
    ... is the archimedes peak

  3. #3

    Default Re: Battery Packs VS Single Batteries

    Quote Originally Posted by sunnyskyez View Post
    Hello to all,

    Im new here, thanks for having me. Ive got a couple of questions on batteries used in cordless landline phones. Been to other sites asking but no one can really answer me as everyone seems to be either in the AT&T is better camp or Panasonic is better camp with no explanations.

    Im shopping for a new phone system, my present 10+ year old phone is a Uniden (no batt backup), that uses a Ni-Cad battery ‘pack’ its also 10+ years old, I haven’t had to replace that battery “pack”. I can talk for 3+ hours without having to recharge it, Ive forgotten to replace it in its charger for a couple of days and I can still pick it up and talk for 3 hours. An instruction on these new phones for the first time charging is, single batts are 7 hours, battery packs is 10 hours. On my 10+ yr old phone the Ni-Cads-battery pack, had to charge for 10 hours for its first charge.


    Both pack and singles have the same amp/mah rating. So what is the difference between the battery pack and the single batteries, besides the battery pack has 2 wires that plug directly into the phone? Does plugging the battery directly into the handset make a difference?

    I look forward to you sage advice. Thanks very much. Sunny
    Without further information it is hard to tell what battery construction is what.
    Nicads are the first rechargeable batteries in phones they had their advantage in that you could trickle charge them all the time with minimal wear on them. Their disadvantage is lower capacity and faster self discharge when not being charged. I've pretty much abandoned nicads in almost everything due to better battery technology.
    Nimh is a better rechargeable battery having greater capacity but having its drawbacks in that the higher the capacity the greater a chance of developing high self discharge rates even greater than nicads. You also cannot trickle charge them much so smarter chargers are needed to prevent them from being slowly damaged left on the charger. The greater capacity can be 2 to even 3 times as much runtime so for short usage you don't have to again return it to the charging cradle.
    Lithium Ion is the technology used I think in newer phones and it has many advantages and some disadvantages. The advantages is even greater capacity, a lot less weight for the same size pack, and typically even smarter charging systems. The disadvantages in the past used to be higher cost but now the cost difference is typically worth it. There is some safety concern with lithium ion batteries if the charging circuitry and/or battery is not designed/built properly you can have safety concerns but properly made systems if used with a little caution aren't a problem. I'm thinking the better phones use lithium ion (which is single batteries 3.7v). The packs are 2-4 cells typically 1.2v nicad/nimh cells.
    If I were buying a phone (cordless) I would research the replacement cost and availability of the batteries/packs as in use over 5-7 years you may end up replacing batteries in them as the batteries don't last forever. I'm not sure of the longevity of lithium ion but it may be under constant use they may not last as long as lower capacity nimh/nicad packs.
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