Everything you need to know about power tool batteries

Everything you need to know about power tool batteries

Buying the right power tool battery can be a tricky business. Navigating through all the different battery types, voltages and amp hours can be difficult and you need to make sure you get the right battery for your tool. So we've decided to cover the basics  for makita battery bl4040 so you can make an informed decision on your next purchase.

different battery types

Before we look at battery power and runtime, we first need to understand the difference between the  LI-ION battery for Makita BL4040 types currently on sale.

The most widely used battery is Lithium-ion (Li-ion). All major power tool brands use this battery technology. In recent years, lithium-ion batteries have surpassed other battery technologies due to their smaller size, energy efficiency and slow self-discharge rate. For those unaware, the self-discharge rate is the rate at which a battery discharges when not in use. The only thing to watch out for is the price, as lithium-ion batteries can cost twice and sometimes three times as much as other batteries.

Nickel metal hydride (NiMH) batteries are also widely used. These batteries are much less expensive than lithium-ion batteries and can provide more current for high-power tools. However for makita battery bl4040 have high self-discharge rates and are susceptible to memory effects.

If you've never heard of the memory effect, it's a condition in which a battery's charge is below its maximum capacity. If the battery keeps charging without being completely dead, the battery remembers the charge point and sets that point to the new capacity (almost trains your battery to charge less).

If you have an older power tool battery, chances are it's a Nickel Cadmium (NiCad). These batteries have been phased out over the past 10 to 15 years because they are susceptible to memory effects, have low capacity and are difficult to handle (they contain toxic and environmentally harmful cadmium).

BL4040 4000mAh replacement for makita Features

 Battery level with 4 bright green LED indicators allows users to clearly see the level

Fully charged in 45 minutes or less

Enhanced cooling system designed to maximize battery life

XGT® batteries feature an advanced engineered impact resistant housing and shock absorbing inner lining designed to protect batteries in harsh jobsite environments

Digital communication in XGT® optimizes performance, delivering up to 2x more continuous power in heavy-duty applications

XGT® tools and batteries are designed with a multi-layer contact interface to provide more stable power delivery for high current demands

Digital communication in XGT® actively monitors and protects against overload, overdischarge and overheating

XGT® batteries feature rigid rails with impact-resistant construction to secure the battery to the tool in high-demand applications


You may have seen the letters "Ah" on a power tool battery. Ah stands for Ampere Hours and represents the amount of power a battery can supply in one hour. For example, under ideal conditions, a power tool with a 5.0 Ah battery would be able to draw 5 amps continuously for 1 hour. It's worth noting, however, that this number is only a base estimate, as 99 percent of the time, the battery won't be in ideal condition.

If you want to learn more about amp hours and why a 5.0Ah battery may perform better than a 2.0Ah battery

When buying a new tool, be sure to read the product description to make sure you have the right battery for the tool.

But before you start buying new batteries for your tools, why not take a look at using a for makita battery bl4040