Power Tool Battery Buyer's Guide

Power Tool

When it's time to replace your power tool battery, AtBatt.com has you covered. Our line of power tool batteries by Amstron are durable, safe and quality batteries. Amstron is the aftermarket power tool battery brand of choice. Amstron batteries extend the life of your power tools, with the same quality standards as the original manufacturer for safe and long-lasting power output to get the job done.

Match the Voltage

Compare and match the voltage of your original battery to the replacement. If your original battery was rated at 14.8 volts, that's the ticket for the replacement battery. Do not go over or under the specified power or your tool manufacturer’s specifications.

Buying the Correct Replacement Power Tool Battery

When buying a replacement battery for your power tool, the easiest way to find the correct replacement is to search by your original battery part number or the model number of the tool.

The model of the tool is usually found on the warning label or name plate. This can typically be found on the bottom or side of your tool.

Battery Part numbers are usually found on the bottom of the tool or battery, along with the specifications. After you have located a replacement battery, verify the voltage is the same as your original battery.

Power Tool Battery Number


Understanding Amperage (Ah)

The higher the amperage or Ah the longer the battery will last on a single charge. Amstron power tool batteries typically have a higher Ah rating than the original battery. Within the manufacturer’s specifications, you will be able to replace your original battery with a higher amp hour rating. This will allow you to work longer.

Amstron Power Tool Battery Price Comparison

If your battery has run down on your power tool, the question is: replace the battery or replace the tool? The cost of replacing the battery versus the cost of replacing the tool altogether is usually the deciding factor. Here's a quick look at Amstron battery prices and some comparable Makita and Bosch power tools, or their current production equivalent. (Pricing info collected in 2013.)

Makita Power Tool Price

Makita Rotary Hammer (HR 160D): Starts at $199
Makita 12V Cordless Autofeed Screwdriver (6831D): Starts at $239


Battery Price Comparison

OEM 12V Makita 1201 Battery (2.6Ah NiMH): $69.00
Price difference of 28%

Bosch Power Tool Price

Bosch 18V Reciprocating Saw Kit (1644K): Starts at $265.95
Bosch 18V Reconditioned Hand Planer (53518): Starts at $247.50


Battery Price Comparison

OEM 18V Bosch Battery (2.4Ah NiCD): $79.95
A price difference of 25%


Buying a replacement battery is a no brainer. It is more cost effect to buy a replacement battery, than buying a new power tool or buying the original battery.

Rechargeable Battery Chemistry for Power Tools

Power tool batteries are commonly found in one of three rechargeable chemistry types: NiMH, NiCD and Li-On. Each rechargeable battery chemistry has different power capacities and characteristics. Each rechargeable battery has different power capacities and characteristics.
Here we explain the differences between Ni-MH, NiCD and lithium-ion and provide resources to assist your Makita aftermarket battery purchase.

NiCD: Nickel-Metal Cadmium Power Tool Batteries

Battery cells that use nickel oxide hydroxide and metallic cadmium electrodes are known as NiCD or NiCAD batteries. NiCD batteries are popular in power tools, but have several advantages and disadvantages.


  • Fast charging, even after storage
  • With proper maintenance, provides over 1,000 charge / discharge cycles
  • Rugged and forgiving if abused. Good load performance
  • Performs well in low-temperatures
  • Inexpensive


  • Memory Effect, needs periodic full discharges
  • Environmentally unfriendly. Cadmium is a toxic metal and cannot be disposed of in landfills
  • High self-discharge, needs recharging after storage

NiMH: Nickel-Metal Hydrate Power Tool Batteries

The nickel-metal hydrate battery, abbreviated Ni-MH or NiMH, has higher energy density than the NiCD. Due to the higher capacity performance, NiMH is the most common rechargeable battery chemistry for cordless power tools in production today. NiMH batteries also have advantages and disadvantages.


  • 30%-40% higher capacity than NiCD
  • Less prone to memory effect than NiCD
  • Mild Toxins, environmentally friendly


  • Full discharges reduce service life
  • Limited service life
  • Does not handles overcharging well
  • During fast charges and discharges, it generates heat
  • Poor performance at elevated temperatures
  • Must be stored in cool dry place at about 40% state of charge

Li-ion: Lithium Ion Power Tool Battery

Lithium Ion batteries, abbreviated Li-Ion, are slowly emerging as the in power tool batteries because they are light-weight, have a good load characteristics, and can provide a higher voltages for more power. That being said an 18V NiCD/NiMH batteries have the same potential as a 18V Li-Ion battery, because they are the same voltage. However, li-ion batteries allow manufacturers to be more flexible in their designs and making higher voltage tools. This means more power without increasing the weight.

However, having a higher voltage doesn’t mean more Li-Ion power tool batteries to have advantages and disadvantages.


  • High energy density
  • Low self-discharge rate
  • No memory effect, no need for periodic discharges
  • Light-weight


  • Aging, even when not in use
  • Higher cost.