Will your charger work with an upgraded NiMH replacement?  
While it's permissible to use a NiCd charger, you should not leave these battery packs on the charger for extended periods of time. They should be removed as soon as the indicator light shows "charged". The reason behind this is that the "Trickle Charge" rate of that specific charger is designed for a NiCd battery pack, so it's a hair too steep for NiMH. If these packs were left on the charger for extended periods of time (overnight to several days), the high trickle charge rate could overcharge the batteries, and would essential "bleed" off capacity. That leads to accelerated wear on the cell chemistry and decreased cycle life. On a side note, even NiCd battery packs should not be left on this charger for extended periods of time. That inevitably leads to "memory effect" and decreased lifespan of the pack.


How do I know if I'm buying the correct replacement internals?
1. Verify that you can access your current internals as some battery packs are glued and not screwed.
2. We base our product by the manufacturers model number, not just manufacturer and voltage
3. Are your cells inside your battery pack standard or compact?
4. How to know the difference between the V1 vs V2 DeWALT replacement battery internals? DeWALT 14.4V and 18V batteries have 2 different types of screw patterns depending on the model. Each listing has a photo example of the screw pattern for the V1 vs V2 battery pack like pictured below.



What does mAh, NiCd, and NiMH Really Mean?
GCBattery uses high quality TENERGY nickel cadmium (NiCd) and nickel metal hydride (NiMH) cells in our products. When looked at Like an automobile, our cells would be comparable to using "Premium - 93 Octane" in your gas tank, vs the traditional "Regular Unleaded - 87 Octane" used by most automobiles. Along those same lines, the milli-amp hour rating (mAh = 1/1000 Ah) of our cells translates to "the size of your gas tank". The higher the mAh of your battery pack, the more work you can do before the battery pack's charge is depleted. Our high-end NiMH battery packs can deliver more energy than 3x the run-time of basic NiCd compact battery packs. NiCd and NiMH cells do have their own advantages and disadvantages, and it varies based on your application. However, in a side by side comparison, the NiMH cells typically comes out on top.

Advantages of NiCd:
NiCd cells can tolerate tons of abuse. For the user who regularly fast charges their battery (1-Hr charge or faster), and uses in extreme hot and cold environments, NiCd will provide more years of service than NiMH on average. NiCd will also tolerate overcharge (being left on a charger inadvertently), much better than NiMH. Finally, when properly cared for NiCd typically provide more than 1,000 re-charge cycles. Our NiCd cells are best suited for home-owner or light-duty usage.

Disadvantages of NiCd:
NiCd provide less the 50% of the work that the same size NiMH can provide on a single charge. NiCd is also prone to "memory effect". If the battery is not drained beyond 1.0v/cell during each use, eventually, the battery will no longer be able to supply its full capacity unless reconditioned. Lastly, NiCd are highly toxic and must be disposed of as hazardous waste. Cadmium, a heavy metal, is extremely damaging to the environment if thrown away as household rubbish. 

Advantages of NiMH:
NiMH is readily available up to 5000mAh in the "sub-c" size cells typically used in cordless tool battery packs, while NiCd top out at 2200mAh in a sub-c cell. The power output of batteries is directly related to the capacity of the cells, and is called a "c-rating". both NiCd and NiMH are readily available in "10c" ratings, which means they can supply continuous current "10x" that of their rated capacity...i.e., a 2200mAh "10c" rated NiCd battery pack can supply 22 amps continuously to a tool, while a 5000mAh "10c" rated NiMH battery pack will supply 50a continuously to the tool, which equates to more than double the torque. NiMH is not susceptible to "memory effect". It is permissible to top off NiMH after each use, and typically provide up to 1,000 re-charges. NiMH is non-toxic and can be disposed of as normal rubbish in small quantities, but please recycle! The lifecycle cost of NiMH is less than NiCd. Our NiMH cells are best suited for contractor or heavy-duty usage. 

Disadvantages of NiMH:
NiMH is slightly heavier than the same size NiCd battery. NiMH cannot tolerate overcharge. While the overall charge protocols between NiCd and NiMH are nearly identical in today's smart chargers, the trickle charge rates of NiCd specific chargers will overcharge a NiMH battery and greatly reduce the longevity of the battery pack. Never leave a NiMH cell on a NiCd charger once fully charged. NiMH have a higher self-discharge rate. If not used regularly, NiMH should be deliberately cycled at least once every other month to avoid irreversible capacity loss. NiMH will wear-out quicker than NiCd, especially when improperly cared for. The initial cost of NiMH is greater than NiCd.


Why is better to repair the battery instead of replacing the tool?
When you have a good tool you know it. Sadly most people think that it is just a tool getting older that causes its performance to decline.  Most of the time the tool itself is fine just the battery is can no long keep its charge and deliver the energy to the tool that it needs.  Not only is repairing the battery cheaper than replacing most tools, but you also get to keep those faithful dependable tools in your tool bag where it belongs.

How do you repair a battery?
1. Visually inspect case and contacts for cracks & corrosion
2. Open pack to inspect cells, thermistor & connecting tabs
3. Determine root cause of battery pack failure & options
4. In case of abnormal failure, inform customer of options
      (Typical issues we repair: blown thermistors or broken tabs)
5. Dismantle pack, recycle spent cells, clean all components
6. Reassemble fully charged & formatted replacement cells
7. Replace & spot weld 100% pure nickel tabs between cells
8. Replace/install thermistor and/or thermal cutoff switch


How long will it take to get my batteries back after I send them out for a Rebuild Service?
For most orders, once the batteries have been received, we will be shipping them back to you within seven days.

What if my battery is not listed?
Give us a call with your battery type and manufacture.  Most of the time we will be able to help you out.