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Battery Test

Donathen RC

$19.99
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This is a new service from DRC. We test your batteries with the WMH Racing battery wizard. This tool is a highly calibrated battery performance measuring device. It is calibrated with $35,000 of scientific lab grade equipment. 

We will write down the performance metrics for your battery, as well as grade them (comparing them to the best packs that we've seen for that style of battery). 

Pricing:

EACH BATTERY IS $20.

Example: If you send 2 batteries and only pay for 1, only 1 will be tested. Both will be shipped back. Please be sure to select the number of packs that you would like to be tested.

When to test your batteries:

When they are new, or when you would like to see the performance metrics of them

Before any "large" event 

What's included:

Performance metrics for your battery

Performance metrics for the best battery we've seen for your battery class (see below)

Grading (A+ through F- scale) 

Bullet connector cleaning (yes your connectors are dirty and need cleaned after each event)

Battery classes:

Battery classes are based on approximate MAH for both 7.4 and 7.6v packs. The battery classes are designed to give you a reference point to compare how good your battery is. 

2s 4000 shorty

2s 4500 shorty

2s 5000 shorty

2s 6000 shorty

2s 5000 stick

2s 6000 stick

2s 8000 stick

1s 7500

1s 8500

Grading:

We are grading the batteries as a reference compared to the best batteries that we've seen in that class. A+ would represent a battery that is as good, or better than the best battery. An F- would be the worst battery we've ever seen. A C would be an "average" battery. Grading is based off of the performance metrics (see below)

Shipping:
We will only ship these via USPS ground advantage or UPS ground(which ever service is selected, if free shipping is selected it will be whichever is cheapest). We would expect you to ship them to us this way. If you purchase a faster shipping method, it will be considered a gift and is non refundable. Please make sure these are packaged well, so they are not damaged.
 
Battery Safety:
We will not test puffed packs. We will not ship puffed packs.
 
A puffed pack will be considered if the pack is budging, if the case is broken, if the label no longer adheres to the bottom case, if there is a gap between the top and bottom of the case. A "full" pack is not a puffed pack.
 
A full pack may have a "hump" in the middle of the battery where there is a measurable difference from the connector side. A full pack occurs from the manufacturer where the battery cell(s) were made with too much material, or are made to the maximum tolerance that will fit inside the case causing a "hump". Full packs are fine to test and ship.
 
Packs that arrived puffed, regardless of if there they were when they left your care, will not be shipped back or tested. Batteries that puff during testing, will not be shipped back, but will have performance metrics(assuming no catastrophic failures) sent via email. If your pack(s) arrived puffed, the payment will be considered a gift for disposing of the batteries and is non refundable. If your pack puffs during testing, the shipping is non refundable and will be considered a gift for disposing of your battery.

We have not seen any packs puff during testing. Puffed packs are a safety issue, and will be treated as such. If your battery does puff, we will notify you via email with pictures.
 
What's included in the performance metrics:
  • Time to 8.0, 7.8, 7.8 volts (2s), 8.0, 7.95, 7.9 volts (1s)
  • Internal resistance on both the Icharger and Battery Wizard
  • Voltage Drop when the internal resistance is checked
  • Average voltage
  • Weight

Testing method:

We will cycle your battery 1 time at 20 amps. Keep the battery at 100* after the cycle is finished, charge back up. Measure the IR and voltage drop, and then discharge down to storage voltage at 35 amps. 

This is a test you can do at home with your own battery wizard. This test is very accurate and repeatable. It gives dependable data that has been duplicated across the USA. 

2 things to note about testing at home. The starting voltage needs to be the same down to the .001v and the temperature needs to be the same to get repeatable tests and reliable numbers. 

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