I own aB&D 14.4 Driver drill modelCD140G. Do I have to discharge
The battery completely before recharging. Also how long to I charge it for.
I also own a Black&Decker14.4 flashlight model FSL 144 Do I have to discharge the battery completly before recharging? How long do I have to charge it for
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Its much more likely that your batteries are not charging up properly. Ni-CD batteries suffer from 'memory effect' and can appear fully charged when only 70% charged. Also they lose charge when being stored. Do not short them out to discharge them! Wait until the drill complains that they are flat and then recharge them rather than when they first start to slow down. Do not let become completely flat (less than 1 volt).
Lithium batteries do have a life span determined by how many times the battery is discharged and recharged and how hard it is worked on the tool. Batteries get hot while charging and discharging and heat is what ages batteries. Lithium batteries, depending on usage, will last from one to three years. I've seen some last five years but that's rare. They also have numerous cells and a circuit board that can go bad and kill the battery. Chargers are designed to check the battery's condition and won't charge a battery if it detects something wrong. If your battery is under one year old, it's covered by the warranty. If it's over, you'll have to buy a new battery.
Rechargeable batteries do have a lifespan, they won't recharge forever. If you have fully discharged the batteries then fully recharged them and they still don't have full power or they only last a couple minutes then they are done. If they won't charge or the charger shows them as defective, the only fix is to replace them.
There is no way to revive a rechargeable battery once they go bad. Rechargeable batteries have a lifespan that is affected by how many times they have been discharged and recharged and how fully discharged they are between recharges. Most batteries will last longer if they are fully discharged before recharging and allowed to cool completely before recharging, heat being the main culprit to their longgevity. They will eventually reach a point where they will not charge anymore or if they do they will not hold a full charge for any appreciable time. The best test for the batteries ability to take a charge is to completely deplete the battery either through working it or sitting on the couch with the trigger pulled until it stops working completely, let it cool down then put it in the charger. If it charges, use it to see how long it lasts. If it dies quickly it needs to be replaced.
Depending on how old or more to the point how many times you have already charged the battery, it may be worn out. All rechargeable batteries do reach a point where they won't charge up anymore. If you have fully discharged the battery and tried to fully charge it up again and it won't take a charge or only lasts a few minutes on a charge it may be time to recycle it and buy a new one.
These batteries have big problems that Hitachi doesn't address very well. Unlike NiCad batteries, Lith-Ion ones must be periodically used and recharged to retain their battery functions, i.e. if they have been sitting on the shelf at a store for an extended period of time, chances are they will be dead when bought and will not accept a charge. If they go dead i.e. no little red light on the charger when you plug the battery unit in...it's basically junk.
If you can return them or exercise the warranty do so. If / when you get new ones DO NOT completely discharge them like you would NiCads. Lith-Ion batteries do not have the "battery memory" issues that NiCads have which means you don't lose running time if you don't fully discharge the battery unit prior to recharge. Completely discharging before recharge will ultimately kill them. Use the 1815X till almost dead and then charge it. It is also recommended Lith-Ion batteries not be stored fully charged i.e. charge the 1815X fully, drive a couple bolts or screws, remove the battery unit and then put it away. Do not leave battery unit plugged into the tool when you put the tool away. This will discharge and kill the battery unit.
There are non-Hitachi substitute batteries now on the market. I'm guessing the same precautions apply but I don't own one of the replacements so I don't truly know.
The actual batteries in the Hitachi BSL 1815X are Sanyo UR18650SAX lithium ion batteries. Lithium Ion cells aren't all that easy to get commercially because of handling & safety requirements. Not certain if you can take apart the 1815X and swap out the bad Sanyo cells.
the battery's are most likely dead, (like the real dead) after many uses of rechargeable battery's they slow stop holding charge at all, make sure when you get a new rechargeable battery you fully charge it once and fully discharge it once this will increase batterys life time
You say will not stay charged? Over what time period? Are you aware Nicad and NiMh rechargeables discharge naturally at 1% per day so where does that leave your power tool after 3 months? Furthermore they only have around 1000 charges in their useful life so you can immediately see how these tools are not for intermittent(ie handyman) use.
There are different types of battery, the old ni-cad (nickel cadium) batts lasted longer if you let them run right down before recharging them as they had a 'memory' which meant if you charged them from half life they wouldn't charge as much after a while. The new Ni-mh (nickel metal hydrate) and li-ion (lithium ion) batterys don't suffer from this problem so you can recharge them whenever you fancy. The li-on batts don't tend to run compleetely out of charge as when tehy have lost a certain amount of power they just stop anyway. If your batt has lost some life it is possible to get it re-formatted' in some cases by having it put on a battery discharge tester. This is a bit of kit that fully discharges a battery from full in a short space of time and measures it's capacity by timing it. Because it completely discharges and recharges teh batt acouple of times quickly it can someetimes reinvigourate the batt.