Instruct: Classify a review into positive or negative sentiment.
Query: Why doesn't Makita improve their 9.6 Volt Battery?

Sevral years ago I purchased several Mikita 9.6 Volt powered tools. Seeking standarization within my shop I felt comfortable that at least the battery powered tools had a common power source.My mistake (and my recommendation to you all) was not numbering the five batteries. Using the batteries indiscrimetly (?) allowed a defective battery to go undetected It wasn't for several years that I had a project that required the constant use of all of my batteries that I found that one would not take a charge. I tried draining the battery down, with hopes to recharge from zero as it showed 9.6V on my VOM. Forget it! When I contacted my local Mikia repair station they indicated that "they never heard of that sort of problem. So I sent "that sort of problem" to them they called back only to tell me that the battery was out of date = so sorry!...so mark your batteries and rotate them before the warranty expires, and you would get a charge out of it.