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Can you use 18 volt charger for 20 volt battery

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  • Drills Master
  • 44,335 Answers

No. It will not charge
to get batteries to charge the voltage in has to be greater than the battery voltage so the charger you want is 20 volts which in fact will probably be charging at 22 volts

Posted on Apr 12, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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rowdy45176
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SOURCE: 18 volt ryobi battery charger...green & yellow lights come on wha

talked to Ryobi and they are vague. It can either mean that the battery is bad, or the charger is bad and another one that maybe the contacts of the battery are dirty or not seating fully in charger. What I would look for in this instance first unplug the charger and look into charging slot to make sure the terminals of the charger are not bent and they come out into the cavity where battery would go. If not gently pull terminal into opening and retry. Sorry I couldn't be of more assistance

Posted on Dec 31, 2008

frankzen
  • 19 Answers

SOURCE: Jobmate 18 volt chordless drill charging

About 60 minutes...max 90 minutes. Do NOT leave it on the charger for hours and hours...that just cooks the battery.

And switch regularly between the two batteries...else the one that doesn't get used will die.


Posted on Apr 04, 2009

  • 4 Answers

SOURCE: delta 18 volt charger broken

buy a new one

Posted on Oct 06, 2009

Testimonial: "you missed the point te charger is "obsolete""

chasemagnum
  • 7 Answers

SOURCE: how to fix an old RYOBI 18 volt battery won't

take a hammer, and apply force. These batteries dont last forever... but i am serious about the hammer... you may be able to free up whats inside (if you know how a batterey works.)... also apply heat.. try to hit it from all angles than slam it down on the back and leave it sit... than try. I hope this works for you my dewalt batteries over the years have don this, and it works.. but BTW. it wont hold a charge for very long anymore.. the battery is pretty much garbage.

Posted on Oct 13, 2009

  • 11 Answers

SOURCE: I have a JobMate cordless drill and 2 batteries.

I found the Ryobi charger fits the jobmate as well.

Posted on Apr 17, 2010

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1 Answer

I need to know what the output needs to be on the charger of an 18 volt jobmate cordless drill.


During the initial state of the charge, the charger operates in a fixed-current mode. This means that the current will be held at a constant rate until the battery is charged to a bit over 18 Volts. During this phase, the output of the charger will not be 18 Volts. This is done for safety and battery preservation; forcing 18 Volts on a battery discharged down to 15 Volts or less could cause the battery to overheat. If no battery is connected, the charge controller may hold the output low until a battery insertion is detected.

The exact behavior of the charger depends on the chemistry for which it is designed, whether Nickel-Cadmium, Nickel-Metal Hydride, or Lithium ion. If the output of a known-good battery is 18 Volts after charging, and it has normal capacity, the charger is working properly.

However, a bad cell in the battery changes things. If you run a Ni-Cd battery down too far, the weakest cell in the battery may begin to reverse charge from the current coming from the other cells. This usually causes an internal short circuit, and the cell will be stuck at 0 Volts. A battery pack with one shorted cell will read 16.7 -16.9 Volts when fully charged, and the drill will not have the peak power it should. The charger will give you a battery fault indication if it is equipped to do so.

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2 Answers

Battery and or charger won't work. Charged a full 18 hrs. Help


Possible suspects are:
1. A severely drained battery.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.

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1 Answer

Cooling fan stopped working


any 18-20 volt laptop charger should work only need correct power plug and that can be easily changed if necessary with soldering iron and volt meter. using old charger plug as replacement. volt meter is used to check out correct polarity of plug before and after you re solder plug on.generally outside is -ve and center is +ve ,alternatively go to ebay or google and type in Sony Vaio PCG 7Q1M charger,or type in part number ,or try 18-20v laptop charger, that is what I do when I need a replacement charger,cost around $10 delivered usually.

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1 Answer

Is it my Black and Decker PS185 18 Volt Battery Charger #418352-03 or my ps145 power pack


You need a volt meter, They are cheap and it will come in handy down the road. The volt meter will tell you if your charger is the problem or the battery has went to battery heaven.

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1 Answer

No display, won't charge, dead, after cold storage


hi, you say the voltage is 3 volts each, then it never work , remember it's requires at least 18 to 20 volts to light up.


if a battery measure's below 10v it's normally impossible to charge again as a lot of chargers will not go below this level, you could try a car battery charger to bring the level up however do this with care and don't leave on charge
Regardswww.gewizrepairs.co.uk

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1 Answer

Will a ryobi 18 volt charger replace a coleman powermate battery charger?What's your problem?


They look different in their shape where the battery goes so I would say no. To be safe always use the charger from the same manufacturer. There are a few different types of batteries too so it is always best to use the model number of your original charger to search for the replacement.

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1 Answer

Makita battery charger wont charge


If both lights on the charger are flashing it is indicating you have a bad battery and the charger will not charge the battery. The charger has circuitry that tests the battery and if it 'thinks' the battery is defective it will not attempt to charge it. The only way to verify whether it's the battery or charger is to try charging your battery on another charger or try charging another battery on your charger. Most of the time it's a bad battery.

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1 Answer

18 volt dewalt lithium ion battery charger stopped working for no reason....


This can happen if the battery is too dead for too long. Keep trying to make it work like you have maybe 20-30 times. Or you can leave the battery in for a few days and let the logic chip do it's job. It should start working in a day or two.

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