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InvisibleBully
CheapShot-SinisterStrike
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Registered: 07/30/04
Posts: 3,229
Loc: Pennsyltucky, USA
Batteries
    #7603398 - 11/06/07 04:16 PM (16 years, 2 months ago)

Like the rechargeable kind.. can you just leave them on there carger till you need them? Or do you take them off and charge them as needed. I had a cordless drill that i didnt use for a while and now the battery wont take a charge. I also have a cordless dremel that still works but i dont want anything bad to happen to it. can i just leave it on the charger? will that help it?


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OfflineDV8
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Registered: 11/01/07
Posts: 34
Last seen: 15 years, 9 months
Re: Batteries [Re: Bully]
    #7603483 - 11/06/07 04:37 PM (16 years, 2 months ago)

you should really let a battery wear its charge out otherwise you are only topping up the top 2 cells (so to speak)
if you let a battery run completly flat..it can recover if caught early
but if its left for say six months the battery can become so depleted that it will never recover 100%

another factor can be the temperature your trying to charge it at
if its cold it will take longer(warmer is better of course)

and then trying to charge an old battery in the cold is even worse IME

HTH
DV8


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OfflineSeussA
Error: divide byzero


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Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 20 days
Re: Batteries [Re: DV8]
    #7603619 - 11/06/07 05:03 PM (16 years, 2 months ago)

> can you just leave them on there charger till you need them?

To a certain extent, it depends upon the type of battery and to a much larger extent it depends upon the type of charger. (Ignore the following for lithium ion batteries.) The really dumb (read cheap to manufacture) chargers simply put out constant current. With these chargers it is very easy to overcharge the batteries if you leave them in the charger for too long. When a battery is fully charged, but is given a constant current, the energy has to go somewhere... and in this case, it mostly goes into heat. The heat alters the molecular structure of the battery causing the battery to hold less charge. (This is commonly, and incorrectly, called battery memory.)

Smarter chargers will charge for a certain amount of time at constant current, and then will trickle charge to keep the battery topped off. These are great, but only if you completely drain the battery first. If you charge a partially discharged battery in one of these chargers, the same problem as described above happens because the battery becomes fully charged faster than the charger expects. (Again, this is commonly, and incorrectly, called battery memory.)

The really good chargers will monitor the temperature of the battery and will turn off (or switch to trickle charge) as the battery warms up. They can also monitor the voltage of the battery to prevent it from going into full charge mode on a mostly charged battery.

Most powertool chargers are of the cheap kind. If you leave your battery in them for too long, they will ruin the battery. A typical NiMH battery should last for 1000 charge cycles if treated properly.

A bit of trivia... the true source of the term battery memory comes from the space industry. They noticed that nicad (NiCd) batteries used on satellites would start to lose maximum charge after many, many precisely timed orbits (thus timed charge/discharge cycles) while in space. The effect is very difficult to reproduce, even in the lab. If you hear somebody talking about battery memory, chances are that they don't know what they are talking about. The memory effect was specific to nicad batteries. Most powertools use NiMH batteries.


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Offlinewindex
old hand
Registered: 06/27/01
Posts: 1,293
Last seen: 9 years, 7 months
Re: Batteries [Re: Seuss]
    #7604242 - 11/06/07 07:32 PM (16 years, 2 months ago)

Quote:

A bit of trivia... the true source of the term battery memory comes from the space industry. They noticed that nicad (NiCd) batteries used on satellites would start to lose maximum charge after many, many precisely timed orbits (thus timed charge/discharge cycles) while in space. The effect is very difficult to reproduce, even in the lab. If you hear somebody talking about battery memory, chances are that they don't know what they are talking about. The memory effect was specific to nicad batteries. Most powertools use NiMH batteries.





HA! And I thought I was the only one who laughed at those battery memory fools!


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