Rechargeable batteries ...

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Rechargeable batteries ...

Postby PatsyMFagan » January 31st, 2019, 4:17 pm

I have been buying these to replace the old ones. I now have 2 chargers - not cheap and neither are the batteries .. however, is it me, or don't they hold their charge very well ? Several years ago I had a new boiler installed along with a wireless remote thermostat/controller. The original batteries lasted most of that time, until last year, when my boiler failed to fire up and the engineer I called out identified that the batteries in the thermostat needed replacing - this I did with rechargeable ones. Just a year later, they now need recharging …. :aww:

What do others think ? Also, how long would you think that unused (but fully charged) batteries should hold their charge ? I am now sitting here getting colder by the minute waiting for batteries to re-charge ;( :shock: and how long should I expect to wait for the batteries to be re-charged as there seems no visual sign on the recharging unit (only a green light that seems only to indicate charging)
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Re: Rechargeable batteries ...

Postby earthmaiden » January 31st, 2019, 4:28 pm

I used to use them for my flash gun when I did photography. Used to recharge quite often and always overnight but no big deal if you make it a habit. Perhaps note in a diary to do every so often?_
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Re: Rechargeable batteries ...

Postby PatsyMFagan » January 31st, 2019, 4:30 pm

earthmaiden wrote:I used to use them for my flash gun when I did photography. Used to recharge quite often and always overnight but no big deal if you make it a habit. Perhaps note in a diary to do every so often?_


Good idea … I think I will be having an early night tonight, with hot cocoa and a wheat pack ! ;)
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Re: Rechargeable batteries ...

Postby suffolk » January 31st, 2019, 4:38 pm

Check the charging unit instructions ... I think on mine the green light on its own indicates the battery is fully charged ... the red light indicates charging and goes out when fully recharged.
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Re: Rechargeable batteries ...

Postby PatsyMFagan » January 31st, 2019, 6:34 pm

I haven't kept the instructions for either … (well not that I can remember :oops:, but iirc, neither of them came with any separate instructions, simply in a sealed bubble pack ) One is a Duracell charger and when switched on, glows red, the other is an Energizer and glows green. Neither of them change colour at all however long they are switched on :o Having done a bit of googling (while supper was cooking) the Duracell one does revert to trickle charge when the battery has been recharged, however, my search revealed no clue as to how long it takes to recharge :?
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Re: Rechargeable batteries ...

Postby Suelle » January 31st, 2019, 6:50 pm

I have never found rechargeable batteries to be very satisfactory. Even though I had two sets for my camera, the second set had usually lost it's charge by the time it was needed. I also think that as they age, they run down faster too.

Most of the thing I have around the house seem to be better with ordinary batteries, as either they keep their charge for longer while not in use (eg torches), or they don't use much power, so ordinary batteries last for ages anyway (thermostats).

When using rechargeable batteries in things only used occasionally, the batteries are inevitably flat when you need them.
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Re: Rechargeable batteries ...

Postby StokeySue » January 31st, 2019, 7:12 pm

I used rechargeable AA batteries in my big digital camera, and when on holiday I used to take two sets and rd barge one every night. Slightly tedious but doable

The special battery in my little Lumix seems to hold a charge quite well as long as don’t use the screen much.

I more or less gave up using them for most other things as I found they conked out too easily, but I was thinking of giving them another go as I have acquired several things that only draw power for a tiny LED bulb so they should work for that.
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Re: Rechargeable batteries ...

Postby Ratatouille » January 31st, 2019, 7:29 pm

We have used rechargables for years. No they don't kast as long but you need 2 sets so you always have a charged set avaiiable/ We have some betteries we have had for 15 years We rarely have to replace any. Expensive at the beginning but well worth it in the end. So two sets for everything and a system to recharge.
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Re: Rechargeable batteries ...

Postby suffolk » January 31st, 2019, 7:41 pm

That’s how we do it Rats :tu:
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Re: Rechargeable batteries ...

Postby PatsyMFagan » January 31st, 2019, 8:05 pm

Ratatouille wrote:We have used rechargables for years. No they don't kast as long but you need 2 sets so you always have a charged set avaiiable/ We have some betteries we have had for 15 years We rarely have to replace any. Expensive at the beginning but well worth it in the end. So two sets for everything and a system to re-charge.
;)

that is/was my intention ….
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Re: Rechargeable batteries ...

Postby aero280 » January 31st, 2019, 9:27 pm

There are some uses that rechargeables don't seem to suit. I find that they don't hold their charge when left on the shelf, so if you keep a set of "charged" batteries ready for the ones in use to go flat, you may be disappointed with how long the second set last. I also find that if you unplug the charger and leave the batteries in the charger, they also seem to go flat quite quickly.

There are some special batteries available for things that have very low current use and expect to last a long time. Maybe rechargeable batteries are unsuited to the thermostat application.
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Re: Rechargeable batteries ...

Postby StokeySue » January 31st, 2019, 9:46 pm

I had the engineer come to my smart link (early Hive thermostat). Both he and the installer said genuine Duracell or at least hi power alkaline batteries, they just don’t like rechargeables or basic supermarket batteries apparently

I find a battery tester useful

I have put some batteries into my AeroCharger
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Re: Rechargeable batteries ...

Postby Rainbow » January 31st, 2019, 9:47 pm

Ratatouille wrote:We have used rechargables for years. No they don't kast as long but you need 2 sets so you always have a charged set avaiiable/ We have some betteries we have had for 15 years We rarely have to replace any. Expensive at the beginning but well worth it in the end. So two sets for everything and a system to recharge.

Agree with that. But some batteries hold charge much better than others when not being used. I find 'eneloop' good, but not sure if they are in UK!!
My computer keyboard and mouse both have 2 eneloop batteries in (AA) and I always have at least 4 spares for when they go flat.

aero280 wrote:There are some special batteries available for things that have very low current use and expect to last a long time. Maybe rechargeable batteries are unsuited to the thermostat application.

I think Aero might be right about that. Rechargeables aren't good for everything!
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Re: Rechargeable batteries ...

Postby StokeySue » January 31st, 2019, 9:58 pm

Pat, I think we cross posted, see my reply to aero
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Re: Rechargeable batteries ...

Postby aero280 » February 1st, 2019, 12:11 am

I got some envelop rechargeable from Maplins before they went bust. But I’m using the rechargeable that I have for some things like the computer mouse and they are OK for that, but I have also bought a stock of 20 AA & 20 AAA packs of Duracell from Costco.
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Re: Rechargeable batteries ...

Postby dennispc » February 1st, 2019, 12:41 pm

I've got one of these.

https://cpc.farnell.com/rolson-tools/28 ... gIQsPD_BwE

Some appliances state not to use rechargeable.

I keep a couple of ordinary Duracell in case whilst others are charging.

Agree about them not lasting as long - hearing aid batteries in particular, even worse in cold weather, but now aids are more sophisticated so take more power.
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Re: Rechargeable batteries ...

Postby Ratatouille » February 1st, 2019, 12:48 pm

We bought our recharger at Lidl years and years ago and it works really well though annoyingly bleeps as well as light change when recharging is finished. I am sick of modern gadgets that bleep at you.
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Re: Rechargeable batteries ...

Postby Riocaz » February 1st, 2019, 2:21 pm

I'm sure those who can't see the lights are grateful for the beep without having to pay a ridiculous premium for it.
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Re: Rechargeable batteries ...

Postby PatsyMFagan » February 1st, 2019, 7:37 pm

PatsyMFagan wrote:One is a Duracell charger and when switched on, glows red, the other is an Energizer and glows green. Neither of them change colour at all however long they are switched on :o Having done a bit of googling (while supper was cooking) the Duracell one does revert to trickle charge when the battery has been recharged, however, my search revealed no clue as to how long it takes to recharge :?


I have to correct my statement above about the duracell charger staying red on charge up .... I left it overnight and this morning the red light had turned green ;) :tu: So I was assured that those batteries were fully charged, inserted them into the control panel and now have central heating (phew). Out of interest, I tested the other batteries that had been charging up in the other (energizer) charger, by inserting them in the duracell charger ... it took another hour before the red light turned green :? :rolleyes:
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Re: Rechargeable batteries ...

Postby PatsyMFagan » February 1st, 2019, 7:40 pm

aero280 wrote:There are some uses that rechargeables don't seem to suit. I find that they don't hold their charge when left on the shelf, so if you keep a set of "charged" batteries ready for the ones in use to go flat, you may be disappointed with how long the second set last. I also find that if you unplug the charger and leave the batteries in the charger, they also seem to go flat quite quickly.

There are some special batteries available for things that have very low current use and expect to last a long time. Maybe rechargeable batteries are unsuited to the thermostat application.


I was wondering how best to keep the spare batteries charged up and ready to go …. seems there is no easy answer :? I was simply replacing ordinary one use batteries with rechargeable ones in the control panel … I expect the specialist batteries will cost more than the rechargeable ones :( :o :td:
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Re: Rechargeable batteries ...

Postby aero280 » February 2nd, 2019, 9:41 am

A similar question about batteries is running on one of the car forums. One guy who is technically minded has just sent this info, so I'll pass it on for you to consider...

Rather depends on the battery. Some lead acid batteries are designed for just this use, low current for a long time, they are however unsuitable for continuous high current short duration cycles. Car batteries are the opposite. However in both uses the battery is quite bulky making them less than useful in many more recent applications.

Alkaline cells are good for low current long duration because they have low self discharge, many rechargeables have relatively high self discharge which is why they aren't suitable. Lithium ion batteries have low self discharge and are used in such applications but their 3.7v terminal voltage means they can't be substituted for, or by, other types very easily. Some of their other characteristics also make them less desirable.

Then there are the new Ni-Mh cells (Eneloop and the like) that have low self discharge and can be stored for very long periods and still deliver a high proportion of rated power. Whether they are any good at low current long duration applications I can't say but they seem to be OK in my rarely used flashgun.
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Re: Rechargeable batteries ...

Postby PatsyMFagan » February 2nd, 2019, 9:56 am

Blimey Aero.... I think I may need to take a degree in battery technology :shock: I learned a bit about different batteries when I lived on my narrowboat … I had a bank of 3 (or maybe 4) batteries ; 1 dedicated to starting the engine and the others for running the electrics on the boat , however, can't remember the terminology now (deep drain ???)
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Re: Rechargeable batteries ...

Postby StokeySue » February 2nd, 2019, 10:14 am

My AeroCharger flashes while charging then goes to a steady red light when done. Easy even for me. The other one has the tiny light change colour, not so easy to see.
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