Bosch Sds Hammer
Bosch Sds Hammer
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I HAVE A BOSCH SDS GBH 24VRE HAMMER DRILL, BUT THE BATTERIES WILL NOT CHARGE FULLY?
do these batteries have a memory, and should i fully dis-charge them before re-charging. I want to make sure i'm not doing something wrong because these are about 60 quid each to replace. thanks.
Are they NiCad (nickel-cadmium) batteries?
Many years ago, NASA did a study on NiCad batteries, where they documented a "memory" effect. What they found was that NiCad batteries would tend to "remember" the previous level of discharge, and that if the batteries were repeatedly discharged to that same point (let's say only 20% of the charge was used each time), that the battery would subsequently tend to rapidly lose capacity after 20% of the charge was used.
Over the years, however, battery companies improved NiCad batteries such that the memory effect was no longer a significant concern. But that same study is quoted time and time again, and entire companies have sprung up to manufacture "battery exercisers" to automatically discharge and recharge NiCads.
As for "fully" discharging NiCads, you should actually avoid doing that. The reason is because that 24 volt battery is made up of about 18 batteries wired in series. Since it's nearly impossible to make 18 batteries that are EXACTLY alike in capacity, it's likely that during a full discharge, the weakest one will actually undergo a "reverse" charge by the remaining healthier batteries. Once a NiCad is reverse-charged, it's capacity will be even more degraded, increasing the potential (no pun intended) for future reverse-charge incidents.
Manufacturers of NiCads were (at one time) recommending discharging only to the half power point (if I recall correctly), which is roughly about where you notice the tool is beginning to become a little weak.
Now, besides all of that, you should also not err on the side of over-doing the charging thing. Many simple battery chargers do not shut off when the battery is fully charged. A battery pack left on one of those will begin to heat up when it's fully charged, and that is also bad for the cells as it can damage the electrolyte.
If you have some extra time on your hands, have a voltmeter, and you know how to solder and obey polarity markings, you can usually resuscitate an old battery pack by finding and replacing that one cell that's the "weak link". This is particularly worthwhile if the battery pack is fairly new and has merely succumbed to a single bad cell.