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The original batteries are not powering the tool though they recharge and have 24 volts.

I recharge them and they die after 2 minutes. They are not used very often, what's happened.

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Batteries do have a lifetime. They will die sooner if you leave them on charge for long periods, and do "wear out" some each time they're charged.

Posted on Apr 21, 2015

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Replace batt

Posted on Apr 21, 2015

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What voltage should come out of a 24 v 3 pin charger? single 12 v pin with two ground pins?


It depends on how it and the wheelchair are wired and how the voltage is derived.

Presumably the 24 volt wheelchair requirement is provided by two 12 volt batteries connected in series and these could be recharged in series by a 24 volt charger and a pair of wires or by a 12 volt charger providing a 12 - 0 - 12 using three wires where one 12 is a positive in relation to the 0 and the other is a negative in relation to the zero making a potential difference of 24 volts.

There could conceivably be circuitry within the wheelchair that requires only 12 volts for recharging and causes the two batteries to be charged separately, though while this method could be desirable and offer some benefits it would be considered unnecessarily expensive and complicated for most commercial purposes.

As usual you really need to know what is supposed to happen or is designed to happen before fault-finding can begin. One of the wires could be a safety ground wire but most likely it is used to provide some sort of feedback to the charger from, perhaps, a thermal switch close to the batteries so charging will cease if too much heat is generated.

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Yes... Your battery died. But why?

First, leave the cables on longer, a good 10 or 15 minutes. When you hear that clicking noise, it's because there is not enough power available to turn the starter. It means you need more power. Leave the jumper cables on for a few more minutes and you will have the power you need to start the car.

Once the car is started, remove the jumper cables and pull the positive (Red) cable off the terminal on your battery. If the car stays running, get a new battery. If the car dies immediately after pulling the positive battery cable off, then your altenator has gone out. The altenator is the electrical generator that provides electricity to your lights, engine, stereo, AC, etc. It should be putting out about 14.2 volts. Since your car is a 12 volt system, there are a couple of extra volts to spare, which are used to recharge the battery. It takes a lot of power from a battery to start the vehicle. That's why the alternator is there to takeover after startup, plus recharge your battery in the process.

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Ryobi batteries are specific to each Ryobi model, so please write down which model number or the original battery part number you have. How old are the batteries?
I had the same problem with many bateries I had at home, like cell-phone batteries and also some power tool bateries. Did not have any Ryobi power tools tho, so don't hold me acountable if this doesn't apply to your hardware:)
Many batteries have the "memory effect" which means that if the battery was not completely empty when it was set to recharge it might now only recharge to the level it was emptied to, so for instance if you used the power tool for 10 mins and the battery emptied to, lets say, 90% capacity, it might occure that the next time you recharge the battery it will only charge to it's 90% maximum...doing that many times lowers the maximum recharge capacity. As I heard the new Li-Ion batteries do not have this problem.
I hope this makes some sence as my english is not that good and it was a bit hard explaining my thoughts:)

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