DOWN4SOUND | D4S JP40 - 12V Lithium Car Audio Battery ( 6000 - 12000W )

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  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
  • Down4Sound DOWN4SOUND or D4S JP40 - 12V Lithium Battery 6000 - 12000W
MSRP: kr12805,66
Now: kr4698,45
Was: kr7261,29
— You save kr8107,20


JP40 12 Volt Lithium Car audio Battery

The perfect solution to 12v car audio lithium battery wonders is here! This will help out those who both do and dont have a high amperage custom alternator. NOTE that having an upgraded electrical with a high output alternator will benefit the JP 40 - 12v car audio lithium battery but is not needed. This 12v car audio lithium battery is good between 6000w thru 12,000w systems. 

Wattage rating varies widely depending on alternator input ( 6000-12000W)
USE ONLY INSIDE OF VEHICLE. (Do not use under the hood or outside of vehicle. DO NOT use with any other type of batteries including different lithium chemistries and any lead acid or AGM batteries)


  • 120-160A alternator - 6,000w rating
  • 240-270A alternator - 8,000w rating
  • 320-370A alternator - 10,000w rating
  • Single 450A Alternator Or Dual 240+a alternators - 12,000w rating

This battery is a Lithium Iron Phosphate (LiFeP04/LFP). Down4sound's JP40 is the most powerful LFP for its size in the car audio industry.

  • JP40 Battery Size is 10.5 inches long, 8.25 inches wide, and 3 inches tall. Weighing in at 14 pounds.
  • The JP40 is the first car audio lithium battery with an integrated voltage and temperature monitoring and notification system. We are taking the guesswork out of the picture.
  • The JP40 also features a compact LOW profile & infinitely expandable car audio lithium battery. The JP40 shares a similar look to JP Amplifiers with its Sleek machined aluminum housing, allowing rapid heat dissipation; a bonus is that's it is easily mountable.

No voltage boosting necessary- DO NOT EXCEED 14.8v as this will cause damage to the battery.

  • Onboard balancing 

Aluminum housing isolated from ground to reduce the risk of short if 12V power accidentally contacts the battery housing.

This product has a metal housing. The metal housing is used to wick away the heat generated by the
lithium cells under high load to keep them cooler and so they can operate at higher efficiency. Metal also
conducts electricity and requires added safety considerations when using this product. This battery is
intended to be properly mounted before use. If the battery is not mounted it is possible for the battery to
shift during use and it could come into contact with metal causing a short to the battery. Extra care must
be taken when attaching ring terminals, bus bars, and other attachment. The insulated area around the
terminals and the safety bar between the terminals make accidental shorts much less likely to occur.
Make sure all wires and connections in the vicinity of the battery are properly insulated to avoid any
accidental shorts.

Charge before initial use, be sure to read the instruction sheet for full instructions. Proper charging is
crucial to the life of your Down4Sound battery. It is very important that the temperature of the battery
remains cool with respect to the charge voltage.
Whether using the terminal adapters, bolts or screws, the tightening torque should never exceed 6 ft-lbs
max on any Down4Sound battery!

Your new Down4Sound lithium battery is the industry leading lithium battery made for pulse discharge
loads. Lithium cells hold, in general terms, three times the energy density of lead acid batteries. However
they need careful management to be safe and provide a long service life. Fundamentally, they have
serious risks associated with them and these must be understood to avoid danger, loss of property, and
personal injury. Don’t let the size of this battery fool you, it is very powerful, and if not operated correctly,
capable of being very dangerous.

Be sure to check out for additional technical and product information.

You may mount the lithium battery in any direction as long as it is secured from short circuits and/or
movement. One word of caution though. This battery is very light and therefore it does not require a great
deal of force to hold it. Do not crush the battery with battery retention systems. The threads are M6-1.0.
Optional terminals are available. Be extremely careful when making connections. Remember there is no
low voltage disconnect, reverse polarity, or short circuit protection on the main terminals of this battery.
Further the power output of a lithium battery is four times that of typical lead acid batteries. Short circuits
will flow huge amounts of current instantly with the ability to melt metal.
Do not expose to temperatures above 60oC (140oF). Avoid mounting this battery in the engine
compartment if at all possible. Elevated temperatures accelerate the aging process of most battery types
and lithium batteries are especially sensitive to high temperatures. Open circuit voltage should be above
12V, when fully charged after resting for 8 hours. If it is less than this after resting for 8 hours, the battery
should be taken out of service and must be checked for capacity, cell balance, and State of Health before
resuming operation.

To reduce the risk of fire or personal injury including burns:
- Do not over charge the battery (meaning exceed the maximum voltage OR amperage and remove the
charger once the battery is at 100% SOC.).
- Do not short circuit the terminals.
Use with alternators requires that the charging voltage be limited to 14.8V or less. 14.0~14.8 is
preferred for 12V models.
- Do not charge this battery with an alternator if the terminal voltage is below 10V.
- Contact Down4Sound for assistance before proceeding.
- Avoid high temperature. Never operate the battery in environments above 140o

F or if the battery itself

exceeds 140o F at any point. WARNINGS(cont’d)

- Lithium batteries contain flammable gases. Have a plan in place to respond to possible fire.
- Disconnect the battery in total before welding anywhere on the vehicle. Do not submerse in water. This
battery is not waterproof.
- Do not crush, puncture, or dispose in fire or water.
- Do not attempt to open, disassemble, or service the battery pack.


JP40 Lithium Battery picture 1


The remote provides real-time monitoring and display of battery voltage, percentage battery
capacity, and the internal temperature of the battery.


  • Low voltage alarm: The voltage display will flash in real time when the voltage is getting close

to fully discharged. Charge battery before the voltage drops below 10V. Do not discharge the
battery lower than 10V or damage may occur.

  • High voltage alarm: The voltage display will flash as the battery is close to the maximum

charge. Do not allow the battery to over charge or damage may occur.
Low temperature alarm:

  • The temperature display will flash if the battery temperature drops

below -20 C / -4 F. If the battery temperature is at or near this threshold it can be charged
with low voltage is
approaching 55 C / 149 F. If the battery temperature is near or at this threshold, discontinue
use of the battery until the temperature drops to the operational range. Over"__mce_add_custom__" title="JP40 Lithium Battery remote " src="" alt="JP40 Lithium Battery remote " width="738" height="644" /> 



In demanding conditions of high amperage discharge, fast charging, and extended high
amperage discharge, it is important to monitor the battery to keep the battery from being
damaged. If the battery is discharged below the minimum voltage the battery will be damaged,
and such damage will cause the battery to lose performance and/or cause a dangerous
operating condition which could result in personal injury, equipment damage, or death. The
same is true if the battery is allowed to over heat, or be over charged. This remote tool is a way
to monitor the battery’s operation within the specified parameters without a putting restrictive
Battery Management System (BMS) that reduces the amount of control the user has over the
battery’s operation. As with all tools, it is only as effective as the user. If the warnings are not
heeded, or ignored the battery may become damaged, and this will void the warranty.


The remote monitor has 2 plugs, a Phone jack, and an 2 pin port. The phone jack is connected
from the remote monitor and the plug labeled “remote” on the face of the battery.
The 2 pin plug on the remote monitor can be used to connect the monitor to a 12V power
supply, (Example: the cars ignition system.) as a alternate power supply to keep the remote
monitor from using the battery’s power.

Connect the battery with the remote monitor using the supplied cable.
To Change Voltage/Capacity Display
The default mode of the voltage/capacity display is the battery’s voltage. If the button
marked “Voltage/Capacity” is pressed, the display will change to the show the battery’s
capacity in percentage of remaining charge. If the button is pressed again, it will return to
the default display.

To Change The Temperature Display:

The default mode of the temperature display is in Fahrenheit (Fo). If the button marked
“Temperature” is pressed, the display will change to the unit of Celsius (Co). If the button is
pressed again, it will return to the default display.


The JP40 Remote Display ships in the default setting that allows for plug and play use with the
JP40 battery. Initial programming is not required when you purchase this remote for use with
JP40. However, this remote is also designed to be used universally with AGM, Li-Po, LTO and
other LFP type batteries in many configurations. Although the programming details shown
below are accessible, they are only applicable to the universal remote model, which includes
the voltage and temperature sending unit that can be used external to any battery. This will
not allow for the accurate internal temperature readings you get from your JP40 Battery since
the sending unit is already inside the battery. The programming instructions are provided
below for knowledge about these functions in case the menu is accessed accidentally, and the
settings need to be corrected for accurate functionality of the remote display.
Press and hold the “Menu” button for six (6) seconds to access the program mode. The display
will flash indicating it is in program mode. If no buttons are pressed within six (6) seconds the
unit will automatically exit program mode.

To set battery type, enter program mode. Use the Buttons marked with the up and down arrows
to select the correct battery type. The battery types available to select are as follows:
L - Lithium Ion Batteries (Li-ion, Li-po) [ Cell Voltage is 3.6V-3.8V ]
F - Lithium Iron Phosphate Batteries (LFP) [ Cell Voltage is 3.2V ]
P - Lead Acid Batteries (AGM) [ Battery Voltage is 12V ]
t - Lithium Titanate Oxide Batteries (LTO) [ Cell Voltage 2.4V ]

Once the battery type is selected, press the “Menu” button again to set the number of cells in
series. The display will once again flash,
Set the number of cells in series using the up and down arrows as before.
EXAMPLE: 3S - is set to 03
4S - is set to 04
5S - is set to 05.... Etc.

After six (6) seconds with no buttons pushed, the unit will exit program mode automatically. If
the setting are not correct, re-enter program mode and select the correct settings. If the remote
setting are incorrect, the information displayed by the remote will also be incorrect.

The limits for the number of cells or batteries in series are noted below:
Lithium Ion ( Li-ion, Li-po ) (L) - L02 - L20
Lithium Ion Phosphate (LFP) (F) -F03 - F24
Lead Acid Batteries (AGM) (P) - P01 - P06
Lithium Titanate Oxide Batteries (LTO) - T05 -T24

JP40 Buss bar setup


The “Universal Bus Kit” is used to connect in parallel two (2) or more batteries. By adding
additional kits more batteries can be added to the circuit. The bas bars also serve as terminal
blocks with seven (7) 0 Gauge or 00 Gauge positive and negative connection ports on each pair
of bus bars.
The “Universal Bus Kit” contains two (2) major components, the bus bars and bus bar spacers.
The spacers are used to fill the space at the ends of the bus bars if only one bar is used. If more
than one bus bar is used to connect three or more batteries, the spacers will always be on the
outer most ends of the bus bars.

1 Spacers, total of four (4) per kit, two per bus bar.
2 Bus bars, total of two (2) bus bars per kit.
3 Set screws, total of fourteen (14) per kit, seven (7) per bus bar.
4 Long mounting screws, eight (8) per kit, four (4) per bus bar.


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Warranty Information

Warranty Information

Your new Down4Sound product is covered by 1 limited warranty if purchased from Down4Sound or an authorized Down4Sound dealer. This warranty does not cover improper installation, accidental damage, misuse, abuse, improper wiring, operation of unit outside of listed specifications, or any product that has been modified or repaired by anyone other than Down4Sound. Your warranty covers defects in materials and/or workmanship ONLY and is not an insurance policy. The warranty only covers the original owner of the amplifier.

All warranty returns must be accompanied by the original sales invoice or receipt. You must contact us to request an RMA number prior to sending any returns via the RMA request form on our website. You are responsible for the cost of shipping your product back to us for warranty examination. If your product is covered under warranty, shipping back to you will be at no charge to you – if your product is replaced/repaired outside of warranty you must pay for return shipping and repair bill prior returning of the product or if no defect is found you are required to pay for return shipping only.

At the sole discretion of Down4Sound your product will be either repaired or replaced when it is being covered under warranty. In the event of shipping damage due to improper packaging on products being returned to Down4Sound the customer is liable for the cost of all damages, necessary repairs, or replacement. Be sure to properly pack your return!

*  Extended additional warranty purchased on amplifiers take in affect from the date of purchase and must also be stated on orginal sales invoice or receipt. 



Refund/Return Policy:


Down4Sound - Hours of Operation

Monday 6am - 9pm PDT
Tuesday 6am - 9pm PDT
Wednesday 6am - 9pm PDT
Thursday 6am - 9pm PDT
Friday 6am - 9pm PDT
Saturday 8am - 4pm PDT
Sunday Closed
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22 Reviews

  • 5


    Posted by BRIAN WALLER on Jul 04, 2024

    I got this because I was getting voltage drops after installing my two deaf bonce asa 6000.1 amps. Now voltage stays above 13 at 2000 rpm, sometimes on real bassy songs it will briefly go to low 12’s but quickly rebounds to 13.5. At idle it will drop to high 11’s on full tilt but before installing amps would go into protect because of the low voltage. I’m running 12k rms so I may need a second one to fully stabilize the voltage.

  • 5


    Posted by Nazhani Wilkie on Jun 08, 2024

    Before I got the jp40 my voltage would dip to the 12s at idle. Not it stays in the high 13s. Definitely the power my system was lacking! Lithium is where it’s at for sure. Jp40 guys. Get it.

  • 5


    Posted by Keane Snyder on Apr 08, 2024

    Great price. Nice and compact.

  • 5

    Great service great product

    Posted by Dustin on Apr 08, 2024

    Wanted one of these for a while saw on Facebook they were going on sale I immediately jumped on and bought one. Wasn’t sure about all the extra stuff due to the fact I was trying to hurry to get cashed out I forgot 2 important parts and when I called in to get them they got me all set up and had them shipped out extremely fast. Thank you down4sound and thank you Johnathan for always taking the time to answer all my annoying questions ???

  • 5

    40ah in a Tux

    Posted by Jeremy J. on Mar 24, 2024

    It don't look like no battery,It don't fit like no car battery.It's different that's 4 sure and I want,just 1 I can start putting this build together...seriously though 40ah wrapped up like a spaceship is flying over all that d.i.y. stuff an those other guy's shamelessly

  • 5


    Posted by Miguel Jiménez on Jan 31, 2024

    Amazing Battery I been waiting to leave this review for the longest since I bought mines during release date and I had 0 issues, I’m running mines with a 5k in a Diesel vehicle and it starts all the time no matter what .2 voltage drop full tilt on stock alt, don’t even think about it just buy it u will be amazed at how powerful such a small battery is.

  • 5


    Posted by LC on Jan 04, 2024

    Maaaaan... I bought this thing when it was 899 and still haven't even had a chance to install it and now it's almost half the price, smh I should have waited. But JP's products are worth every penny. You get what you pay for from experience of previous purchases from JP. And after hearing how d4s all started, much respect to the passion to car audio. I don't regret spending 899 for the jp40 but now I wish I waited and I could have got more stuff from d4s with the difference hahaha. Keep up the good work JP!.

  • 5

    Jp 40

    Posted by Jo on Dec 25, 2023

    Love buying this on black friday sale for $720 now it's just $539

  • 5


    Posted by Q on Dec 18, 2023

    Man ! Man! Man! I just picked up jp40 and I couldn't wait get home to install it. I am blown away on this baby can do, and I'm just running a stock 160 alternator. It's 11pm and I'm shaking up the stars with the power its giving off. From here on out I'm buying everything D4S baby. I can't wait to wake up in the morning just to turn the car and let it play man ,only thing I don’t like are terminals , but besides that I like.thanks D4S . You will be hearing from me soon. .

  • 5


    Posted by Willard galusha on Jun 05, 2023

    Wow. That's what I needed. Proper power and this jp40 is absolutely the top tier for power. I love what it has done for my system

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