Current turn-around times at our facility have been averaging 5-7 business days for most smaller orders.


BAT101 Coolest Cooler Lithium Battery Rebuild Service (Upgraded to 2600mAh)

$32.99 $55.00
Shipping calculated at checkout.

Charging Recommendations

1. Always ensure that the battery is not hot and is at room temperature before charging.

2. Once charged, remove the battery from the charger. Do not store the battery on the charger for extended periods of time. Please note that storing a battery in a charger that is not plugged into the wall, can potentially cause the battery to drain back into the charger. This was more common with older chargers and we have also noted it in some newer chargers.

3. It is recommended to not store the battery on the device when not in use. Storing the battery separately removes the possibility of the device slowly draining the battery. 

4. If you have not used the battery for 2-3 months, we would recommend recharging the battery and if possible, use them. This helps maintain their health.

5. Lastly, be sure to store your battery in a dry environment. If possible, avoid temperatures below freezing and above 110F to maximize battery life.


Li-Ion batteries may be regulated for shipment based upon their size. Below are links to the regulations from the three main shipping carriers for shipping lithium batteries. 

USPS will transport batteries that are up to 100Wh per section 349.222 that can be found here.

UPS will transport batteries that are up to, but not including, 300Wh per their information that can be found here. UPS Hazmat Phone: 1-800-554-9964

FedEx will transport batteries that are up to, but not including, 300Wh per their information that can be found here. FedEx Hazmat Phone: 1-800-463-3339

Another reference link can be found here. Page 5 references batteries that are being sent for recycling.

DOT Helpline Phone Number: 202-366-4433

PHMSA Information

Sample labels that are used for Li-Ion battery shipments can be found below.

Label 1

Label 2

Label 3

This is a battery rebuild service!

You must ship YOUR battery to us to be repaired. We DO NOT sell new, used rebuilt, or aftermarket battery packs.


Rebuild Service for a Coolest Cooler BAT101 battery pack. For the cost of this service, we will open your battery pack, replace all cells, test, and reassemble. Cases, connectors, and circuit boards are re-used and are not replaced or serviced. The performance of our battery packs is better than that of a brand-new battery but at a fraction of the cost. Send your BAT101 battery to us and let us make it work as well as new. Our trained technicians work on Coolest Cooler brand batteries each day. We rebuild all types of Coolest Cooler brand batteries. Don't wait any longer. Send your BAT101 battery pack to us for repair today!

Note: When we are rebuilding your battery, if your circuit board is found to be defective, we will contact you. At that time we will provide you with the option of sending us another battery or we can refund you for the rebuild service. The old cells are removed and recycled prior to circuit board testing and cannot be shipped back to you. 

Additional information regarding these battery packs and recommendations for their care can be found here.

Orders containing lithium batteries will ship by ground only regardless of the shipping method chosen. If you desire shipping insurance on the shipment from us back to you, please click here to add it.

Payment & Security

Payment methods

  • American Express
  • Diners Club
  • Discover
  • Mastercard
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor do we have access to your credit card information.

Customer Reviews

Based on 23 reviews
Debra M.
Coolest Cooler secret weapon!

My kickstarter Coolest Cooler was great until the batteries for the blender died and could not be replaced. I found MTO after a quick search. They are awesome. The communication is excellent and what a fast turnaround. I am talking a week. My batteries came back charged and ready to go. Thank You!

Riccardo I.
Works as promised

I thought my coolest cooler was done. Then I had MTO refurbish its battery and now the coolest cooler is back! Thank you.

George A.
Rebuild of Coolest Cooler Battery

I thought my Coolest Cooler Battery was trash after it wouldn’t take a charge any longer. Then I found MTO on the internet. Shipped it off to them and had a BETTER battery back from them in 2 weeks. Thanks for the great service!!

New rebuilt battery better than original

I had thought I would never be able to use my Coolest cooler again inasmuch as the company has disappeared. I was searching for a replacement battery when MTO appeared in my search. I read about their service and decided to take a chance. Thank you for rebuilding my Coolest battery and improving it! Now my Coolest cooler does everything it did when new, only a little better.

Peter P.
Fast, easy and honest!

It was a pleasure to deal with a company that delivered exactly what I needed and what was promised. A complete 5 Star performance. Thanks!