Comments on: How long do Ni-MH batteries last if they are unused after being charged?

By: iridflare

iridflare — Tue, 03 Feb 2009 01:52:58 +0000

A problem I’ve had with rechargeables is mixing batteries with different charges - the more simple minded chargers stop before they’re all fully charged. I’ve had far fewer problems since I bought a charger with individual channels and a discharge option.

By: Ignacio F

Ignacio F — Sun, 01 Feb 2009 22:06:10 +0000

JD,

Common knowledge is that NiMH batteries will loose about 1% of their charge every day if you don’t use them. In theory this means they would keep their charge forever (keep multiplying 0.99 x 0.99 forever and you’ll never get to 0).

In reality it means that batteries charged two months ago will barely hold any juice like you described.

Are your batteries really old? With recharcheable batteries getting cheaper and cheaper, have you tried a set of new ones?

Hope this helps!

Ignacio

By: BOB H

BOB H — Sat, 31 Jan 2009 11:18:00 +0000

the experience I’ve had with rechargeable batteries is they will hold their charge for several days if not weeks before you put them in a device to use them

By: Dr. Sam

Dr. Sam — Thu, 29 Jan 2009 10:54:17 +0000

I was going to write a shorter version of Petra’s answer, so I’ll just add my vote to what she said.

Top your batteries off with a fresh charge the day of your special event, including at least one spare.

Don’t carry it bare in your pocket or it might short out and discharge.

Turn off that LCD or set it to the shortest review time available.

Have fun and vote for Petra’s detailed answer.

Fred and Petra’s suggestions about the e2 Energizers is good in case your NiMH batteries die. They cost twice as much as alkaline batteries, but last four times as long. My son can’t keep track of a charger, so this is what he uses and he says they seem to last forever.

By: Petra_au

Petra_au — Tue, 27 Jan 2009 21:51:45 +0000

2300mAh NiMH rechargeable batteries should give you a reasonable amount of power (much more than 20-30 photos).

NiMH rechargeable batteries are designed to self discharge at the rate of approx. 1/2-1% per day when not used…so you should ALWAYS make sure that your charge them at least one day before…or on the day of intended use.
And also, when rechargeable batteries are brand new, it will take several discharge & charging cycles before they reach their full capacity.

Using Lithium non-rechargeable batteries such as Energizer e2, are a good alternative because they retain their charge when not used. However, I wouldn’t recommend them as your only power source because they are throwaways and are quite expensive…but perfect as an emergency backup.

So, as long as you charge your batteries before an important event…then I don’t see any problems whatsoever.
But remember, that a digital camera does require a lot of power to run…and you can also help to extend the life of your batteries by…turning off the LCD screen and using the viewfinder instead, limiting the use of the flash & zoom and also the reviewing of your photos.
good luck…

By: Fred S

Fred S — Sun, 25 Jan 2009 22:43:26 +0000

It has been my experience that these rechargeables will drain off slowly after they are charged fully. I have been through the same problem and finally gave up on them. The good alkalines or the Energizer E2 batteries (in my opinion) work the best.
If you are able to locate some Lithium-Ion batteries in the AA size you might have better luck.

By: Dingo R

Dingo R — Sun, 25 Jan 2009 14:54:10 +0000

20-30 pictures …is very low. Look for a 2500mA set of rechargeable batteries - a brand name. Should last around around 80 - 100 shots. And always a back-up set ready !