Why the battery of an electric screwdriver may not charge
In recent decades, cordless tools have conquered even niches where the dominance of conventional power tools seemed unshakable. Even impact drills are made with portable battery power, not to mention regular screwdrivers. Despite the overall high reliability of cordless tools, the weakest point is still the batteries, as well as, to some extent, their chargers. Having found that the battery of a portable electric screwdriver is not charging, you must localize the fault and decide to repair or replace the faulty unit.
The most common causes of battery failure include:
- Corrosion and oxidation of the contacts due to storage in high humidity conditions;
- Deep discharge due to prolonged non-use;
- the expiration of the charge-discharge cycles;
- lithium-ion batteries may have internal control circuitry failure;
- High loss of capacity due to the “memory effect” in batteries prone to this phenomenon;
- drying out of the electrolyte due to prolonged use or storage;
- mechanical damage (including internal) due to shocks to the battery case.
Chargers often lose performance due to:
- corrosion and oxidation of contacts caused by the same reasons;
- hidden breakage of the power cord (most often near the housing or plug);
- failure of internal components;
- bent contacts due to mechanical impact.
Determining the true cause of the malfunction is important for deciding whether to attempt a battery and recharging device repair.
How to properly charge a screwdriver battery for the first time?
For any battery there are one and the same rules that must be strictly adhered to. If the battery of a screwdriver or a battery before you start using the screwdriver has never been charged, it must be done according to certain recommendations. This process is also called cyclic recharging of the screwdriver battery.
The process is very simple. You will need to fully discharge the screwdriver’s battery in the process, so that when you press the button it will not make any noise. And then put the battery to charge overnight, for about 12 hours.
The screwdriver battery itself can be charged for one hour to four hours with constant use. to four hours, but these first three times, we will keep the battery on charge, exactly 12 hours. The first three charges. This is what all the experts advise and there is no sense not to trust this method.
How long does it take to fully charge a screwdriver?
Many users want to understand how long to charge the battery of an electric screwdriver. In such a case, there are instructions for the tool or indicators on the charger. Sometimes neither.
The average amount of time it takes to charge is 7 hours.
Domestic screwdrivers Interskol, Vihr, Ermak, Zubr require less time. Interskol is considered a versatile electric screwdriver. it can be used as a drill. Top brands like Bosch, DeWALT, Makita, Metabo or Dekker charge faster.
If the power source just needs to be recharged, half an hour is enough. But don’t do this to nickel cadmium batteries. With their memory effect, they will fail quickly.
There are different modifications of the chargers. The usual ones, without any frills, come with home screwdrivers. Their charging time is from 3.5 to 6.5 hours. And how much an electric screwdriver is charged by the pulse charger also depends on the model of the tool.
Impulse charger is capable of charging a battery in half an hour. This is a plus and minus at the same time. The disadvantage is the high cost of such tools. The same recommendations are also valid for some car batteries.
Much depends on the power of batteries. Household tools can have a voltage of 12 and 14.4 в. Professional models reach voltages of 18 volts and higher.
How to charge the Li-ion battery of a screwdriver and other important rules for its use
- Li-ion battery packs work best at 10 to 45° C.10 to 45°C. Charge at temperatures between 10 and 30°C.
- Every 4 months, do a complete discharge/charge cycle to calibrate the charge level sensor on the battery controllers. So, discharge to almost 100% and charge for 12 hours.
- Store the Li-ion at 40-60% charge. Do not store 100% charged Li-ion batteries, because you will lose 20% of its capacity over 3 months if you do. Properly stored. at 40-60% charge. Li-ion will irrevocably lose only 1% of its capacity in the same 3 months.
- If you have two Li-ion screwdrivers, charge one to 40 or 60 percent and store as a backup. Once a month, make it work by charging to 100%, discharging to 40-60%, and then storing it again. The second Li-ion is the main working. Once you’ve worked, put it on a charge at the end of each day, even if it’s less than 10% discharged.
EASY FIX FOR A DEAD ‘NOT CHARGING’ LITHIUM 18650 BATTERY FROM A CORDLESS TOOL BATTERY PACK. PART 2
Use backup Li-ion if main working Li-ion is dead due to intensive work and you have no time to wait for its recharge.
That’s it. Now you know how to charge the Li-ion battery for an electric screwdriver.
I gave one of these to every carpenter, and even hung it up in the shop on the bulletin board.
And here’s another question. why have I switched from Ni-cd to Li-ion cordless screwdrivers?
These are the advantages of Li-ion batteries over Ni-cd batteries:
- At least 2 times the specific capacity;
- self-discharge is several times less;
- No memory effect, allowing for recharging at any time
- Withstands on average twice as many charge-discharge cycles, which means it lasts twice as long.
- Li-ion batteries are subject to aging. So are Ni-cd’s forever?? Also getting old.
- Li-ion has lower resistance to low temperatures. This is all in the past. They make Li-ion now that they work at.10° C is a sure thing. And some sources indicate that even at.I can work at 30°C;
- Li-ion batteries require the use of an original charger only. So what’s the big deal? All screwdrivers are sold with their original charger included.
- Li-ion has a high cost. Not so much. Recently I was in a store. Ni-cd batteries under 1 t.р. haven’t seen. And on AliExpress you can buy a whole electric screwdriver with Li-ion for 3 tons.р.
And finally, if you work with an electric screwdriver professionally. do not doubt especially. it will collapse at the same time as the Li-ion battery. So you probably do not need to buy separately Li-ion battery.
Just with reasonable non-vandal use the electric screwdriver should last for a couple of years.
And, yes, one more important rule. Do not skimp on the power of an electric screwdriver. It corresponds to the voltage of the battery. Get a 20 volt Li-ion battery. It’ll spin like a beast.
And buy a weak one, it will be of little use, and joy to save a penny will not be either.
I got 25 volt Li-ion electric screwdrivers. Carpenters can’t get enough satisfaction. Especially after 14 volt Ni-cd.
I think that’s it. Still have questions, don’t agree with something. write in Комментарии и мнения владельцев.
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How to properly charge, discharge and store Ni-Cd batteries
How to tell: the screwdriver is still low, but the rpm has dropped noticeably. This means that the battery is about 5-10% discharged.
- Recommended temperature for charging from 10 ° C to 30 ° C.
- Recommended operating temperature from.20°C to 40°C.
- Charge only with original charger. That is, the one that came with the screwdriver. It is desirable that the charger has a function of automatic shutdown after a certain number of hours. when buying a screwdriver pay attention to this.
- Allow the battery to cool for 20 minutes before putting it on charge.
- Allow the battery to cool for 20 minutes after charging. Then load it in the screwdriver.
- Keep the Ni-cd battery discharged (up to 5-10%).
- After storing the Ni-Cd battery for longer than 6 months, the battery should be “exercised” by 5 charge and discharge cycles.
By the way, a sign that points 5 and 6 were not followed. “dead” batteries are bloated. So clearly their “life span” was not cared for.
That’s all. Now you know how to charge, discharge and store your Ni-CD battery for your screwdriver.
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Types of chargers
Screwdriver comes with one or two batteries with charger. Nowadays, the trend among power tool manufacturers is to sell their products without batteries. This marketing ploy makes buyers buy models of manufacturers that are already in their arsenal. In any case, if you buy a battery, even separately, you can get a battery charger to go with it. It’s also a matter of mechanical design. one manufacturer’s charger probably won’t fit another manufacturer’s.
The recharger is almost always optimized for a particular type of battery, charges it in the most favorable current mode, stops charging automatically at the end of the process. That’s why when buying the charger and batteries of one manufacturer you don’t need to think about compatibility as long as the charger is designed for the same brand and type of battery.
Most gears are sold in a pulse version. But for nickel-cadmium batteries there are chargers that are considered professional (the cost is appropriate). They are called pulse-reverse. For every positive impulse they give a small amplitude negative polarity impulse. This removes the memory effect inherent to Ni Cd batteries and maintains their capacity.
Do batteries need to be recharged before storage??
If a cordless tool is not being used for a long time, experts suggest that it is important to pay careful attention to the battery cells.
For nickel cadmium batteries, it is recommended that you discharge them before storing, not to zero, but to the point where the tool is no longer at its full potential. In the case of prolonged storage, 3-5 complete cycles of discharging and recharging are necessary to restore the capacity of the battery. When using the tool, it is also advisable to ensure that the battery is fully discharged before recharging.
Nickel-metal hydride batteries have a higher self-discharge rate than previous cells. It is recommended to store them charged, and after a long “rest” to charge about a day. Partial discharge is preferred for this type of battery. Their capacity decreases after 2-3 hundred charge-discharge cycles.
Lithium-ion batteries, characterized by the absence of the “memory effect”, may be recharged at any time, no matter what their degree of discharge. These batteries have the lowest self-discharge rate with high capacity. It is not recommended to fully discharge them, because it may cause shutdown of the protective circuit. Power tools with these batteries have control electronics that disconnect the cell from the load when the temperature or voltage rises. It is recommended that these batteries be stored at 50 percent capacity. The number of charge-discharge cycles does not affect the capacitive characteristics of the cells, but their lifetime is limited to about two years.
Charging the nickel metal hydride and nickel cadmium batteries
Nickel-metal hydride and nickel-cadmium cells are charged with a stabilized current. As the battery is being replenished, the battery voltage rises and the charger output voltage synchronously increases to maintain the current at a predetermined level. The end of the procedure is signified by the beginning of battery voltage decrease.
For NiMH batteries the decrease is less pronounced, so often the chargers for them are equipped with additional devices to monitor the end of the process. for example, temperature sensors.
It is even more correct to charge NiMH and NiCd batteries in reverse pulse mode. when the positive pulse of current is followed by a brief negative. This will prevent the “memory effect” decreasing the capacity of the battery. A similar algorithm is provided by professional chargers.
Unusual methods of electric screwdriver battery charging
It also happens that the “native” charger from a power tool is either lost or fails, and it is very problematic to buy the same one. Many people ask if you can recharge a battery by connecting it to any other power source.
It is certainly possible to do so. And such ways of charging will not cause any harm to the battery, if you are well acquainted with the characteristics of the tool itself and any other charger that can serve as an alternative source of power for the battery.
In order to find the right alternative charger for your screwdriver, you need to know its voltage and capacity. They are usually found on the outer casing of the tool. You should also consider the polarity. It can be different, depending on the manufacturer. This is very important in order to connect the battery to the charger correctly.
This is how you determine which charger is right for your screwdriver. For example, we have an 18 volt electric screwdriver with a battery capacity of 2 A / h. So the charger should be able to supply the same voltage and you should be able to get about 200 mA per hour, since it takes a long time to fully charge such a battery. It’s best to use a battery charger with the ability to regulate the current, charging the battery for 6-7 hours.
You can use small alligator clips to energize the battery. And to make sure the contact is good, they can be additionally fastened with metal wires.
MAKITA RAPID CHARGERS HAVE A HIDDEN FEATURE YOU DON’T KNOW!
If possible, try charging an electric screwdriver battery with a car charger. It is important to remember that the voltage in this case should be set to the minimum. Determine what polarity the battery and the auto charger have (as already mentioned, it can be different). Then connect the terminals from the car charger directly to the battery. Sometimes for optimal contact, you also have to use additional “fixers” in the form of paper clips or flexible metal plates.
After these simple manipulations, all that remains is to plug in the device and carefully monitor the charging process. About 15-20 minutes might be enough for starters. and when the charged battery of an electric screwdriver will increase the heat output, the charger should be turned off.
Recently it has become very popular to change the batteries in an electric screwdriver from cadmium to lithium, especially among professionals who regularly use an electric screwdriver. The charging time of the battery in this case will also depend on the type of charger. If you have a regular “regular” charger the battery can be charged in 3 to 7 hours. And if you have the opportunity to buy a modern battery charger, it will be enough to bring the battery into working condition.