12V 40AH Sport Series Lithium Battery w/ Bluetooth (1240-BT)

(5 Reviews)
$299.00

Free shipping

Applications For This Battery

12V40AH Sport Series Lithium Battery with Bluetooth and Built in low-temp charging protection! (1240-BT).

Items you may need with this battery:

Download ManualDownload Sports Series WarrantyApple StoreGoogle Playstore

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Capacity
40AH
Voltage
12.8V
Weight
14 lbs
Size
7.6” x 5.2” x 7.25”
Warranty
10 years

BMS: Yes
Chemistry: LFP
Efficiency: 98%
Memory: None
Max Charge/Voltage: 14.6V
Peak Discharge: 120A – 3sec
Cut-off Voltage: 10.5V
Max Charge/Discharge Current: 40A
Operating Temp: -4°F – 140°F
Low Temp Charging Protection: Yes
Cell Type: Prismatic
Bluetooth: Yes

THE MILLERTECH® SPORT SERIES LITHIUM BATTERY
10 YEAR GUARANTEED WARRANTY IS SIMPLE!

TERMS:

From the date of your battery purchase through year number 10 of ownership, your battery is covered. If it stops working during this time, we will repair or replace it with a battery of equal or greater value for FREE!

SHIPPING:

We cover all shipping costs associated with shuttling your battery back and forth for repair or replacement. It is our warranty; it is our cost; not yours.

EXCLUSIONS:

There are NONE! You trusted Millertech®, and if it’s within the warranty period your Millertech® battery is completely covered for everything!

PROOF OF PURCHASE:

You don’t need one. If it’s Millertech®, it’s covered!

FOR WARRANTY SERVICE CALL: 855-MAX-LITH
EMAIL:  warranty@millertechenergy.com

Customer Reviews

Joe Becker
Rating: 5/5
Quality product!
12V 40AH Sport Series Lithium Battery w/ Bluetooth (1240-BT)
Wed Nov 05 2025 13:33:26 GMT+0000 (Coordinated Universal Time)
Christopher Sanno
Rating: 5/5
Great Product
The 40 Amp Hour is Perfect for my Garman 106SV with Live scope bundle. I’m able to fish 14 hours a day without worries.
Tue Aug 19 2025 23:21:40 GMT+0000 (Coordinated Universal Time)
Cheryl Bevan
Rating: 5/5
12V 40AH Sport Series Lithium Battery w/ Bluetooth (1240-BT)
Wed Jun 18 2025 00:31:32 GMT+0000 (Coordinated Universal Time)
Tripp Poplin
Rating: 5/5
Best batteries available
Tue Apr 01 2025 14:47:46 GMT+0000 (Coordinated Universal Time)
Larry Treece
Rating: 5/5
Battery
Shipping was fast. Haven’t hooked up the battery yet but I’m sure it will work fine.
Thu Dec 05 2024 15:10:00 GMT+0000 (Coordinated Universal Time)

What the pros are saying about Millertech batteries