Rechargeable batteries

loulou41

I am using 9v rechargeable batteries for a cat scarer. Does anybody know how long should I left them to be recharged? The manual says it will turn green when it is fully charged but even after an overnight charge the lights are still red. The rechargeable batteries lasts only a week which is not vey good & I need to keep recharging them. Thanks

Myser

What is the make of the batteries and which charger are you using?

SplanK

Sounds like the battery's are past their best and no longer holding charge correctly. They can only be recharged so many times, and if fast charged, this value is even less!

I world say try new bats

tony6403

Nearly all rechargeables are good for 1000 cycles.
5 to 7 hours should be enough to recharge your batteries.
My charger does not always change colour on its indicator so I give them 6 hours regardless of the indicator and they always have power.
The length of time working with your scarer will depend upon the drain which that device is placing on the batteries and the capacity of the batteries ( they will have mAh printed on them).
So it may be that a week is all you're going to get if the scarer is using up the available capacity fairly quickly.

cyclonebri1

tony6403 wrote: »

Nearly all rechargeables are good for 1000 cycles.

Sorry Tony but from my experience that is far from true, even using high capacity top quality batteries I have never got anything like that in camera equipment, (high powered flash guns, the only units I use enough of to draw that conclusion).

We have also had rechargeable hand held vac with lithium batteries that have failed within a year, but then maybe we are just unlucky

The obvious answer would be to by another battery, or a shotgun;);)

Norman_Castle

On my charger the charge light or timer does not work when charging 9 volt batteries. Work out the time for your charger and batteries and use a plug in timer if you have one.

http://convert-to.com/491/recharging-rechargeable-nimh-nicd-batteries.html

Re-charging 9 volt rechargeable batteries

Time control for charging of common 9V rechargeable batteries ( NiCd and NiMH 9 V batteries.) The timer takes longer because these can only be charged at much lower current rate of 0.1C or 1/10C ( mAhr/10 = charging time in hours ) of their mAh capacity value. Usually between 30 mA to 100 mA depending on the 9V battery capacity in mAh.

loulou41

I am using digimax batteries with digimax charger.

Ectophile

It may depend on your charger. I have a charger that does AAA, AA or 9V batteries. For the AAA or AA batteries, the light goes green when it's done, but not on 9V ones. In addition, it only trickle charges 9V batteries, so that needs 10 to 15 hours, depending on the battery type.

Myser

loulou41 wrote: »

I am using digimax batteries with digimax charger.

You may want to try a different battery that is able to hold its charge longer:

http://www.7dayshop.com/7dayshop-good-to-go-rechargeable-9v-nimh-battery-250mah-2-pack

It is also possible that your charger is faulty. First try different batteries in it and if the light still does not change state after fully charging a battery, you might have a faulty charger.