377°
EXPIRED
Energizer Rechargeable Batteries 9V 1 Pack Battery *Instore* - 75P Tesco
Energizer Rechargeable Batteries 9V 1 Pack Battery *Instore* - 75P Tesco

Energizer Rechargeable Batteries 9V 1 Pack Battery *Instore* - 75P Tesco

Buy forBuy forBuy for£0.75
GETGet dealVisit site and get deal
Just been in my local Tesco Metro in Macclesfield and noticed these rechargeable 9V Energiser batteries for 75p. the tag on the shelf isn't one of the usual sale type yellow tags - see picture below.

Online these are still £6.70 and looking round the web that is about the same price everywhere.

Please note this is instore and not online.

Some blurn from the website follows:

An Energizer rechargeable 9V (PP3) battery. This battery can be recharged up to 1,000 times and is ideal for frequent and heavy use.

Energizer Rechargeable NiMH round cell batteries are available in all sizes, including AA, AAA, C, D and 9 Volt sizes. They can be recharged to full power at any time using a broad range of chargers - including the family charger, compact charger and ultra fast charger. Since the cells are rechargeable up to 1000 times, they're a good economic and environmental choice. It makes them ideal in high drain devices such as portable CD players, remote controlled toys, hand-held games, palmtop computers or any time you want to replace your standard batteries in your household's battery operated devices when you use them a lot.

Hope the pic link works below:

12 Comments

Original Poster

http://img210.imageshack.us/img210/261/9vbattery.jpg

Bargain

can these be used in smoke alarms?
can they be charged by a normal AA/AAA charger?

can these be used in smoke alarms?can they be charged by a normal AA/AAA … can these be used in smoke alarms?can they be charged by a normal AA/AAA charger?



Yes and no.
Your charger will need the connections to match the top of the battery, ie, one male and one female.

Great price. Will check them out later.

seaspray

Yes and no.Your charger will need the connections to match the top of the … Yes and no.Your charger will need the connections to match the top of the battery, ie, one male and one female. Great price. Will check them out later.



NO YOU CANT USE THEM IN SMOKE ALARMS!!!!

royals

NO YOU CANT USE THEM IN SMOKE ALARMS!!!!



Why cant you? Mine work fine in them
Edited by: "Birdkeeper_chris" 11th Dec 2010

Nice deal, will look out for them - nice it doesn't look a reduction or special offer either

Out of stock in Antrim ..great find though

Birdkeeper_chris

Why cant you? Mine work fine in them



Your not meant to use rechargable batteries because they go flat quicker than alkaline/zinc batteries, you probably wont even hear the low battery warning too (they die that quickly)

Edited by: "mcfly666" 11th Dec 2010

mcfly666

Your not meant to use rechargable batteries because they go flat quicker … Your not meant to use rechargable batteries because they go flat quicker than alkaline/zinc batteries, you probably wont even hear the low battery warning too (they die that quickly)

That is correct - not only do they fail quickly when discharged but they also self-discharge relatively quickly and will be completely flat within a year, which is how long non-rechargeables are supposed to last in smoke alarms. What you need are the hybrid types - "Hybrio", "Eneloop", "pre-charged" or 7dayshop's "Good to Go". Their slightly lower capacity compared with non-hybrid types is more than made up for by their much lower self-discharge rate, which means they are also ideal or use in clocks and remote controls - anywhere where you'd expect a battery to last many months. They can also be charged in exactly the same chargers as conventional rechargeables. There is no excuse for buying non-rechargeables any more, since hybrid batteries came along, and the sooner they are legislated out of existence the better.

Edited by: "pibpob" 11th Dec 2010

Why cant you? Mine work fine in them



Apologies if my post was a bit brief.
The yes, was to yes you can use them on smoke alarms.
The no, was to standard AA - AAA chargers, which need the connectors for the 9V as I explained. Standard AA chargers don't have the facility to charge 9V batteries.
My smoke alarms are wired to the mains and use rechargeable batteries. The cheap stand alone alarms may be different, but I don’t see why rechargeable could not be used. Imo hybrid would be over specified. And where would you buy a 9V hybrid block for 75p???
I would have no problem in installing these in smoke alarms and recharging them whenever necessary.

seaspray

My smoke alarms are wired to the mains and use rechargeable batteries. … My smoke alarms are wired to the mains and use rechargeable batteries. The cheap stand alone alarms may be different, but I don’t see why rechargeable could not be used.

Let me explain more clearly then. There are two reasons. The first is that a non-rechargeable will have a longer shelf life than a standard rechargeable, so you will have to change the batteries more often. The second is that the voltage of a non-rechargeable droops much more gradually as it (self-)discharges than that of a rechargeable. The smoke detector measures the voltage of the battery to assess its condition. Therefore, smoke detectors which assume they contain a non-rechargeable will warn that it is getting low when it has discharged far more than if it had been a rechargeable. This means that by the time the warning is sounded, the battery may be far too weak to provide the huge current necessary to sound the alarm (in the case of a mains failure).

I have a digital audio recorder which has a menu option where you can tell it whether it contains rechargeable batteries or not, precisely so that it can be more accurate in its estimation of remaining capacity.

And where would you buy a 9V hybrid block for 75p???

Where indeed - but put one of these 75p batteries in and you are compromising the operation of your smoke alarm.

I modify my comment above: legislate AAs, AAAs etc out of existence (like light bulbs of 60W or more) but give the PP3s a few more years as the smaller number sold means that they are both much less of an environmental nightmare and the economies of scale in producing hybrid versions have not yet been realised.

Edited by: "pibpob" 11th Dec 2010
Post a comment
Avatar
@
    Text