Makita lithium ion battery wont charge - Makita 2 Bl1830 18v Battery,dc18ra Charger Lxt Fr Drill

Yes, because the voltage and amperage input to the charger is constant, so the board management dumps excess charge once the battery is fully charged. The battery cools, but the charger warms up. Mine does the same. It is a 15 minute charger, so the current is high.

Makita DC18RC 18V Lithium-Ion Rapid Optimum Charger

https://www.amazon.ca > Makita-DC18RC-Lithium-Ion...
Industry leading charge times of 15 min. · During the charging process, the Rapid Optimum Charger monitors actively controls the current, voltage and temperature ...
Battery Cell Type: ‎Lithium Ion
Style: ‎Plug
Batteries Included?: ‎No
Power Source: ‎Ac

Given the problems with Makita Li-ion batteries there are 2 likely reasons, you have a faulty charger or both batteries are faulty, the best option is to find another charger to try your batteries on and see if they charge, depending on the age of the drill you may be able to get the batteries or charger replaced by Makita, a lot of them have been replaced out of the warranty period because they are known to fail prematurely, take the faulty item back to the place of purchase with you invoice and put the pressure on for replacement

I did get an educated electronics eng. tell me li ion batteries 4handtools,are manufactured to only be recharged a set number of times,to avoid tool damage.

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.

on my charger (DC18SC) alternating red and green dual flashes mean a defective battery.
http://ubermanuals.com/product/makita-dc18sc-8866 also same for the DC24SA

Sorry Mate your battery is dead...
The makita lithium batterys dont like getting worked hard quickly.
There is a chip in them that recognice each battery to each specific charger. Try another charger. This has not worked for me. Try anyway

your batteries are toast;must replace

Battery has to be cool before you put in charger,also check contacts for dirt etc..cheers

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

replace charger/ burn or busted