Question about Makita Tools 18V 1/2" Lxt Lithium - Ion Hammer Driver - Drill Kit - BHP451
This is the second battery battery that wont charge both under a year old
onlt one of 3 now charging any ideas ?
This normaly happens when the battery has been kept in cold conditions . keep your batteries indoors try sitting them on a radiator for a short period and they should take a charge . cold weather effects the cells in lithium ion batteries .
Posted on Feb 09, 2009
If you have
been a bad boy and managed to short the battery by using it for non-proscribed
purposes, the fusible link will blow (kind of like a fuse)
To fix it, open up the battery (use a Torx 10 security bit, or a small flathead in a pinch) On the battery connection nearest the spring-loaded white catch there is a small bridge of metal with a hole in the center. If this is melted you can solder it back together by sanding the two pieces and putting a glob of solder on them. This will void your warranty (duh!) and remove the battery's fuse protection, but it WILL work again.
If the link is intact and nothing else is obviously wrong, you almost certainly have a bad cell. I recommend pulling out the bad cell ( it will be the one that does not read between 2.5 - 4 vdc) and replacing it with one from another dud battery- this requires some fudging and re-soldering.
Or do what I did, pull the cell, toss the electronics and the short pink wire, add a cigarette lighter socket and voila! you have a portable power supply giving around 14 volts. Charge it up by wiring two cigarette lighter male ends together (check polarity , + to + and - to -) and plug it into your car, but only while it is running or you will be charging your car battery with it!
Hope that helps.
If your battery reads well below 10-12volts….
Try charging the battery with a car charger set on low (2 amps max) or a wall transformer from a phone or some such with a 12vdc output (make sure it is 12vdc not 12vac) You will need to know which of the charger wires is pos and neg, be careful not to short the battery as this will blow the fusible link. Connect + to + using jumper clips or stiff wire jammed into the battery contacts.
Once you get the battery over 10-12 volts the charger will normally accept the battery.
You can jump one good battery to the bad to do this, but in all cases watch out that the wires do not get hot, as this is a BAD sign, often a minute or two will be enough.
Of course you may have a dodgy charger, they are not robust at all.
The fans also ****, noisy and sometimes they quit, causing the charger to quit too
Posted on Aug 18, 2009
I have just had a similar issue I left the drill unused for a period and when i placed it in the charger the charger showed the battery as charged after about 15 seconds.
Following a internet search I found a site that suggested for a simlar problem with a camera jump starting the low battery with a 9 v battery. I had a spare 18v from the drill so placed a contact from + to + and - to- and held for about 2 mins. I then placed the battery back in the charger and it started charging. Running the battery down as we speak to recharge again well worth a try. If you dont have a spare maybe the 9 v would work
Posted on Aug 05, 2012
I have a Makita BL1830. The pack reads 18.5 volts. Each pair of cells read 3.7 volts. It reads as defective when placed in charger. Charger works fine on BL1850 reading 20.2 volts.
I think these companies put a usage timer in circuitry to make you buy new batteries!
Why else would a battery reading good voltage on the pack and each pair of cells?
I was able to put a little charge on it with a different lithium ion charger and I got the pack to 20.5 volts and the cells to 4.1 volts, which is well within the limits of the pack and cells.
Posted on Mar 18, 2019
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