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Rechargeable Ni-Mh Batteries - AA Cell Size (2900mAh) - Pack of 20 - £19.95 @ 7dayshop

phillredphillred

5 packs of 4 x 2900mAh Rechargeable batteries. Each pack complete with protective, modular cases for under £20 delivered to your door
supplied with a FREE plastic (semi-transparent) storage case

I bought some of these a while ago and they are thicker than normal aa's
they wont fit in some compact devices
- Billy Congo

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All Comments (58)

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    MartH
    Are these 1.5v or undervolted like most cheap rechargeables are?
    johnraggett
    splatsplatsplat
    leekickass
    great deal heat added but who needs this many rechargeables ?oO


    you dont have kids do you


    I would have said the same question six months ago, but every toy needs batteries!!
    MartinG
    leekickass
    great deal heat added but who needs this many rechargeables ?oO


    Used them for the last few years as a professional photographer, work great. I have about 20 sets :)
    slimy31
    I've given up buying unbranded rechargeables, I've had so many that won't even charge the first time let along hold their charge. Duracell rechargeables may be around twice the price, but they're so much better.


    MartH
    Are these 1.5v or undervolted like most cheap rechargeables are?


    Most rechargeables are 1.2 volts, not just the cheap ones.
    dr_adams
    slimy31
    MartH
    Are these 1.5v or undervolted like most cheap rechargeables are?


    Most rechargeables are 1.2 volts, not just the cheap ones.


    "The voltage for rechargeable batteries is more consistent than that of regular batteries
    Even though alkaline batteries are rated at a nominal 1.5 volts, they only deliver 1.5 volts when they are fully charged. As they begin to discharge the voltage of alkaline batteries continuously drops. In fact, over the course of their discharge, alkaline batteries actually average about 1.2 volts. That's very close to the 1.2 volts of a NiMH battery. The main difference is that an alkaline battery starts at 1.5 volts and gradually drops to less than 1.0 volts. NiMH batteries stay at about 1.2 volts for most of their discharge cycle."
    MartH
    dr_adams
    slimy31
    MartH
    Are these 1.5v or undervolted like most cheap rechargeables are?


    Most rechargeables are 1.2 volts, not just the cheap ones.


    "The voltage for rechargeable batteries is more consistent than that of regular batteries
    Even though alkaline batteries are rated at a nominal 1.5 volts, they only deliver 1.5 volts when they are fully charged. As they begin to discharge the voltage of alkaline batteries continuously drops. In fact, over the course of their discharge, alkaline batteries actually average about 1.2 volts. That's very close to the 1.2 volts of a NiMH battery. The main difference is that an alkaline battery starts at 1.5 volts and gradually drops to less than 1.0 volts. NiMH batteries stay at about 1.2 volts for most of their discharge cycle."


    Interesting. I've got a set of brand new Energizer rechargeables (1.2v) that don't work with my Wiimotes, any idea why? Non-rechargeables work fine.
    richto
    Dont bother with these type of batteries in anything that you dont charge regularly (Especially smoke alarms, remote burglar alarms, etc)

    For that you need to buy this type: http://www.hotukdeals.com/deals/8-x-nimh-rechargeable-low-discharge-stay-ready-batteries-10-50-vapextech/952263

    And use the charger here: http://amzn.to/n2pqzZ

    Edited By: richto on Jul 17, 2011 22:30: .
    richto
    MartH
    Are these 1.5v or undervolted like most cheap rechargeables are?


    I think you are confused. Alkalines are 1.5V only when fully charged, and 0.9 Volts when nearly discharged.

    NiMh are ALL ~ 1.45 Volts when fully charged, and are 1.25V for the majority of their discharge life.

    NiMh can also supply much higher currents due to lower internal resistance without effecting total battery capacity, whereas alkaline batteries will loose significant capacity at higher current loads.








    Edited By: richto on Jul 17, 2011 17:15
    csiman
    robsprocket
    csiman

    and smoke alarms warn you when the battery gets low! DOH!


    Not keen on being woken by that annoying noise they make when the batteries go flat, especially at 3am. Think I stick to standard batteries with a longer life and just change them every six months. Would be a shame if the rechargeable suddenly went flat just as the fire starts. DOH!

    "a problem with rechargeable batteries is a rapid voltage drop at the end of their useful charge. This is of concern in devices such as smoke detectors, since the battery may transition from "charged" to "dead" so quickly that the low-battery warning period from the detector is either so brief as to go unnoticed, or may not occur at all."

    DOH! - you do realise these will probably be better than most alkaline batteries!
    richto
    Not for long term use they wont. NiMH old type self-discharge over time, and its unavoidable.

    "The self-discharge is 5–10% on the first day and stabilizes around 0.5–1% per day at room temperature"

    So worse case It will be totally dead in 3 months just in storage, let alone in use.

    So unless you charge them more frequently than every couple of weeks, the lower capacity batteries I linked to above will actually give you a greater useable capacity...

    Edited By: richto on Jul 17, 2011 18:04: .
    Smiff
    richto

    DOH! - you do realise these will probably be better than most alkaline batteries!


    what are you talking about? as has been said repeatedly, standard NIMH batteries - which these appear to be - self discharge quickly (i forget the exact % - guy above posted it) so are not suitable for low drain apps like remotes and alarms.
    for that you need New Tech/Hybrio type or standard alkaline..

    these are good for things that need lots of power quickly e.g. cameras, toys

    Edited By: Smiff on Jul 17, 2011 17:31
    mystik
    Cool! 20 mini explosive devices! Hot if you think it's ok to save a few quid on rechargeables!
    databar
    richto
    Dont bother with these type of batteries in anything that you dont charge regularly (Especially smoke alarms, remote burglar alarms, etc)

    For that you need to buy this type: http://www.hotukdeals.com/deals/8-x-nimh-rechargeable-low-discharge-stay-ready-batteries-10-50-vapextech/952263

    battery test Note where vapertech comes againt 7 dayshop.
    1duck
    csiman
    SHOWMAN36
    csiman
    leekickass
    great deal heat added but who needs this many rechargeables ?oO

    people with remote controls, bike lights, smoke alarms, etc etc!

    bit of a silly comment really!


    "Silly comments" here's a very silly one......

    "people with remote controls, bike lights, smoke alarms, etc etc!"

    Using rechargeables in a smoke alarm is a definite no no(unless they are the Eneloop type) they're also not that great in remote controls.

    utter crap as per usual!

    I have some in my Logitech universal remote and havent had to recharge even after 6 months use.

    and smoke alarms warn you when the battery gets low! DOH!


    i have logitech remotes with non rechargables in them which haven't had them changed in 3 years...so really what he was saying wasn't crap.

    You just got called out and can't face it.
    richto
    To save reading, VapexTech are best of the lot, and 7 dayshop the worst...

    Anyone that purchased these have a C9000 charger and can tell us how bad they really are?

    Edited By: richto on Jul 17, 2011 17:46
    ScottChegg
    20 batteries is a lot but saying that I reckon ive got about a dozen kicking round the house that are getting tired and need replacing. Good deal
    spaceinvader
    1duck
    csiman
    SHOWMAN36
    csiman
    leekickass
    great deal heat added but who needs this many rechargeables ?oO

    people with remote controls, bike lights, smoke alarms, etc etc!

    bit of a silly comment really!


    "Silly comments" here's a very silly one......

    "people with remote controls, bike lights, smoke alarms, etc etc!"

    Using rechargeables in a smoke alarm is a definite no no(unless they are the Eneloop type) they're also not that great in remote controls.

    utter crap as per usual!

    I have some in my Logitech universal remote and havent had to recharge even after 6 months use.

    and smoke alarms warn you when the battery gets low! DOH!


    i have logitech remotes with non rechargables in them which haven't had them changed in 3 years...so really what he was saying wasn't crap.

    You just got called out and can't face it.


    this is getting boring :|
    SHOWMAN36
    csiman
    SHOWMAN36
    csiman
    leekickass
    great deal heat added but who needs this many rechargeables ?oO

    people with remote controls, bike lights, smoke alarms, etc etc!

    bit of a silly comment really!


    "Silly comments" here's a very silly one......

    "people with remote controls, bike lights, smoke alarms, etc etc!"

    Using rechargeables in a smoke alarm is a definite no no(unless they are the Eneloop type) they're also not that great in remote controls.

    utter crap as per usual!

    I have some in my Logitech universal remote and havent had to recharge even after 6 months use.

    and smoke alarms warn you when the battery gets low! DOH!


    You seem to be in a minority of one as per usual DOH!.............So stop making a prat of yourself and grow up!

    Edited By: SHOWMAN36 on Jul 17, 2011 18:12
    Bal
    pot luck on how long they last. Last time I bought them there was a high failure rate after a year or so worth of use.
    Billy Congo
    for some reason these batts or the ones that I received(a while ago) are thicker than normal batterries and so do not fit in torches or other snug battery compartmentos! and so the uses are limited.

    they are good batts though...

    Edited By: Billy Congo on Jul 17, 2011 19:43

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