0delusion

The correct answer to this question is.... Use the Makita MAKSTAR ADP03 Automatic Refreshing Adapter. AFAIK it's the only makita product that refers to "remaining capacity" of a batt pack in this manner. It will give your Makita lithium or NiMh battery packs a "refreshing" charge/discharge cycle that may take between 4 and 9 hours. After the cycle it will report how worn out your pack is, reporting remaining pack capacity percentages of... less than 40 40 to 60 60 to 80 80 to 100 IT WILL NOT REVIVE battery packs reported as dead by standard chargers. Neither will the full battery checker system. If it did, we'd have reports of people going into service centers with dead packs and returning with revived packs. IT WILL RESTORE some "useful service lifetime" to old packs. It is not a charger by itself, it must be used in conjunction with a standard charger which you almost certainly already have. To use with NiMH packs you'll need an additional adapter. It has been available to Makita service centers since around early 2010, as a part of the larger "MAKSTAR Battery Checker System", which includes another adapter and computer software. I have uncovered evidence the ADP03 started to become available as a separate item in 2014. You will find It's quite expensive, but if you use a service that watches prices and reports when they reach your price point, you'll be able to get one much cheaper. I saw one that sold for $41 but paid $91.71 for mine. It's up to you if you have enough batteries that need conditioning to justify the expense.