Battery problem for the Makita 18v 8443D cordless drill
Hi - one of the batteries a DWF NiMh 3.0 Ah does not seem to accept a charge - I have followed all instructions to the letter including those about battery care. There does not seem to be a special circuit for discharging the battery - I supose you just run it flat. Any ideas?
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Based on experience I can tell you that it is is generally the temperature/cutoff/individual cell monitoring sensor in charger that dont allow the batteries to take a charge. Once the same condition is detected 3 times by the same charger it considers the batteries to be bad and refuses to accept it. I have 2 batteries that wont charge on one charger but works perfectly fine when i charge it on my other Makita charger so basically there is no problem with my batteries. I would suggest first you check the voltage of your drained battery by a test multimeter. For 18volt battery if it is close to 18volts 1-2 volts less is just fine! Then there is no issue with your battery. Makita chargers are very expensive hitech which is useless in my opinion the lipo chargers (used in rc hobby) example skyrc are better quality cheaper and does a better job and you can easily charge your makita battery with it as well but this is only recommended if you decide not to go with Makita charger any more. Some basic information about multi chargers for Li-ion battery to follow the safety is make sure you use the right connectors with correct polarity. For 18v volts max voltage should not exceed more than 20.50 and the allowable charge current is 2.7amps also ensuring that batteries dont heatup.
The Makita 18V LXT Lithium - Ion Cordless Impact Driver Kit Model BTD140 us the BL1830 battery, there are several types for it, 1.5Ah, 3.0Ah, 4.0 Ah. Maybe 5.0Ah battery for it will be available. And, the inside of the BL1830 uses the 18650 battery cell. If you have a good knowledge and skill about electronic, you can buy some 18650 cell to do it yourself. If not, I suggest you to buy a brand new one.
If the battery fits in the tool normally, without forcing it, yes both batteries will work in your tool. The AH (Ampere Hours) rating on batteries is a measurement of how long the battery will last on a full charge. Higher AH ratings means the battery lasts longer on a charge but usually at the expense of a slightly larger and heavier battery.
I can't find a Makita model 6391D drill but they do have a model 6390D drill that takes the 18V Ni-Cd pod battery. The tools and radio don't care what type of battery you use, only that they are 18V. However, to date, Makita does not make a Li-Ion, pod battery. All of their Li-Ion batteries are the slide-on type. Your options for that 18V tool is the 2.6ah Ni-MH battery (PN 193159-1 for a single or 194158-6 for a twin pack), the 2.0ah (PN 192827-3) and 1.3ah (PN 194107-3) Ni-Cd batteries.
according to the schematic I saw yes you can and I think that you will be pleased with its performance, their operator manual even lists the weight of tool with this battery. Makita has a 1 year limited warranty on the Li-Ion battery that you might want to consider if you have the receipt.
Lithium batteries have a limited lifespan, typically 3 or 4 years, and their capacity between charges decreases over the years. To extend the lifetime of a battery it should be run completely flat after every few charges rather than topping it up. New batteries need to be charged several times and run flat under normal use before they gain their full capacity.
If both lights are flashing it means the battery is defective so it won't charge it. By defective it could mean the battery is just worn out or there may be a short in the battery. If the battery is under warranty you can get it replaced at a Makita Service Center, if not you have to buy a new battery.
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.
I think your tryiong to charge NIMH batteries oon a charger designed for Lithium Ion batteries. With all the new style batteries such as NICAD, NIMH and LI-ION, charging becomes difficult. Most chargers pre NIMH and LI-ion, were designed for NICAD's. The best advise, match your batteries with the correct charger