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Resetting memory on NiCad batteries - Televison & Video

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I don't understand why this is under projection TV's myself. Maybe I missed something, but here goes the explination.

NiCad, or Nickel Cadmium batteries are really touchy with charging. Overcharging and undercharging really hurt their overall lifespan. Also, recharging with a partial charge left in the batteries can cause a decrease in life as well.

Best ways to maintain a Nickel Cadmium Cell is to follow the following instructions.

1 : Always make sure the first charge is as recommended by the manufacturer. Usually about 1.5 times as long as a normal charging cycle.

2 : Run the cells completely dead before attempting to recharge. This keeps the cells from having left over power and actually short charging.

3 : Never under or over charge these batteries. Always follow the exact instructions for the cells you're using. This will keep a high lifespan over the lifetime of the cell.

Now these batteries gain a memory in "lost charge" times. You can somewhat gain some time back by following those steps, however once they are shot; they are pretty much done. If they won't hold a charge for more than a few minutes, it's time to replace.

A good alternative however if you can change over to NiMH or Nickel Metal Hydride type batteries. These batteries have no memory and the cells will last through more charges then the elder NiCD style. These cells are much more reliable and can take a lot more abuse then NiCD.

Posted on Sep 25, 2008


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Posted on Jan 02, 2017


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Does it hurt battery to keep plugged into electricity all the time?

If it is Lead Acid or Lion that is fine to float charge but not NiCad. The NiCad batteries have a memory effect and will quickly degrade if not discharged.

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Is the battery a Nicad or Li-ion type, if Nicad, then that is the culprit.

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Extending the battery life?


You have a Motorola CP-680, so that's the Make/Model of the radio.

You haven't informed me as to the type of battery you have powering the set. Is it a battery pack?, is it battery cells and if so what type of cells....AA or AAA? or whether it's a rechargeable type, i.e,. Nicad, Lithium, NMh, this info is required so we can quickly provide the answer, Having said all that, I'll do something I don't like doing, and take a guess....

Because it's a GP series radio, It may in fact be a battery pack, therefore it will either be NiCad or Li-ion. That being the case, you must have a battery charger that came with your radio. If you have a NiCad battery Pack, that is the culprit, as these batteries retain memory between each charge, and unless you completely drain all power from them, before recharging, you will not be getting a fully charged battery, as these will only top up the charge from the previous charge, if you follow my drift.

Better to buy Li-ion battery pack specific to your radio, as these don't have a memory issue, these are available on ebay for a reasonable price.

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My pro 39 scanner loses memory after unplugged for 24 hrs..Question: is there a memory storage battery inside unit..

Here's a link to your radio's manual. Make sure the rechargeable batteries are able to accept a full charge. If they have been recharged more than a couple of hundred times, they may need to be replaced.

Pay attention to which jacks your are powering the radio through. The PWR and CHG jacks perform some similar, but very different functions.

The AC or DC adapter can be connected to the CHG jack when you wish listen to the radio (and recharge at the same time) ONLY when NiCad batteries are installed (or to simply recharge the NiCad batteries with the radio off). Recharging with the radio off will allow the batteries to recharge fastest (10 - 18 hrs).

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1 Answer

I have a problem with a yaesu ft470. When I turn it on it stays for 3 sec. then shuts off. The battery says they are fully charged.

Hi Fred,

What type of battery are you using?

Is it Nicad or Li-ion?

There are batteries and there are batteries, some good some bad.

If you're using Nicad battery, then that is likely to be the culprit.
Nicad types have a memory issue, where if you re-charge before the battery goes completely flat, they will only recharge from the point of the previous charge, that in simple terms means, not fully.

and the more you charge them without being fully drained, the more memory they keep, and the less of a charge they get.

The bast batteries I can recommend are Li-ion or Lithium batteries, these are designed for equipment with high power use as in radios, Laptops and of course the cell phone, to mention a few.

These do not have memory issues and last longer than most and are available as rechargeable, sure they cost a little more, but what price for quality.

I hope that this is the issue you are having, and that I have helped you.


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My dear friend,

If you want to repair your old nicd and want to make them work like the new ones then of course there is a solution to all your nicad battery related problems. You don't have to buy new ones because you can repair it at home. There is this very nice and efficient Nicad Battery Repair Guide through which you can recharge the old Nicad batteries within no time. With the help of Nicad battery repair manual, you can recharge the old batteries using basic home tools. I tried it myself and now I never buy new Nicad batteries anymore!

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The red light will flash flash more slowly when the battery is being discharged.
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3 Answers

Need a downloadable copy of owners manuals.

Initially the green light Must come on, but begins to flash within 5 mins or so,..this indicates that the Battery has been drained enough to start the charging process,..Most of the time we plugg in Battery with alittle bit of charge (even if it already has insufficient pwr to operate the device or tool) The charger's (diodes) will detect this resistance (back charges) and will maintain Green LED lites as long as 15min, until the battery is drained to its minimal charge capacity, before it begins to pump in a pulse of 0.6 amps/sec of charge in the battery. NiCad battery have (what is called) Memory. It is an amount of nuetralized charge in the cell when you force feed (charge) in a NiCad, that will begin to occupy (molecularly) your Nicad cell if you dont drain your battery completely between charges. In short- Drain your bat COMPLETELY before charging or it will accumulate Nuetral charges until your NiCad fails to hold full charge capacity..This will definely keep the green lite ON- when your NiCad is 90% occupied by this Nuetral charge and there's no space in your Nicad to dump charge into anymore...But you can still rescue your Battery if you so choose- buts thats another story.

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