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December 1, 2023

Universal lithium ion battery pack, industrial version with outputs 5V to 19V. DC UPS capable

Bag style 7.5 to 22 AH battery pack with chargers 2.3 amp hour battery pack, portable battery power for battery portable applications.
For 7.5-22 Amp-Hour portable power station click here
Useful energy storage 60 watt-hours
Portable battery lithium ion 5v, 6v, 7.5v, 9v, 12v, 14v,16v or 19v PST-MP3500 including PST-MP3460
PST-MP3500-I with cord and PST-MP3460 add-on pack
The output voltage of this unit is DIP-switch selectable. This locks in the voltage. There is a helpful label on the back of the unit that shows how to adjust the voltage. This industrial version also has more voltages selectable.

This powerful little battery pack is very flexible, it can act as a 5 volt battery or a 19 volt battery with 14 steps in between. Outputs at 5V , 5.5V , 6V , 6.5V , 7.5V , 8.4V , 9V , 10V , 11V , 12V , 13V , 14V , 15V , 16V , 18V , or19V. It can also be charged with voltages as low as 9 volts and as high as 24VDC.

This portable rechargeable battery pack consists of a 60 watt hour lithium ion battery assembly and two DC/DC converters. The first DC converter allows the pack to be charged with a wide range of voltage inputs. The second allows the pack to deliver a user settable voltage to run equipment requiring 5 volts to 19+volts. All this is built into the sleek black battery case.

For example, this industrial model is used by OEMs to be their battery back-up to add UPS features to their equipment as well as portability. You can run the system from the included charger through the battery pack. When the AC power fails the battery takes over with no interruption in service. This is called a double conversion UPS with DC output.

Special Features :
  • 60 Watt-Hour battery pack with flexible output voltage (upgradeable to 120 watt-hours).
  • Automatic overcharge protection
  • Gas gauge feature tells how much battery power is remaining
  • Highly regulated voltage source, doesn't sag in voltage like batteries do.
  • The PST-MP3500-I is designed to charge while running your equipment, just plug the charger into the PST-MP3500-I and the battery pack into the laptop computer.
  • The charger section of the battery pack has a DC/DC converter with a wide input range. This means that the pack can be charged from a wide variety of sources. The input voltage for charging can be as low as 5 volts and as high as 24 volts. This makes the PST-MP3500-I perfect for energy harvesting type charging from (for example) unregulated solar panels as long as the input voltage doesn't go above 24 volts.
  • This can be used as a DC battery backup. If you run your instrument from the pack while the pack is being charged from the mains the battery will take over when the mains fail.
Price List Quantity:1-10 11-50
Price includes Battery, case, bag, AC charger, cable kit and barrel plug adapters
Add-on battery which doubles the capacity of the MP3500-I
PST-MP3500-cable kit. Optional extra output cable and connector kit.
SDY-C53F (ZHJX002)
adapters with a barrel connector input and screw terminal output
Optional barrel plug to screw terminal adapter
$2.50 each
Part Number PST-Cig21
Optional car charger

Price $8.00 each
Model Number PST-MP3500-I Battery Pack
AC Charger The included power supply for charging has an input of 90-240 VAC, 50/60 Hz, 19 volts output. It will charge the battery in about 1.5 hours
Charging voltage The charging voltage can be between 9 volts and 24 volts. The current drawn from the charging source is limited to about 1 amp, so the pack will charge faster at the higher input voltages.
If you are also running a load then the input current raises to the power required by the charging plus the power required by the load.
Continuous Output Power 4 amps or 60 Watts, see the output current a different voltages chart below
Output Voltage Steps 5V , 5.5V , 6V , 6.5V , 7.5V , 8.4V , 9V , 10V , 11V , 12V , 13V , 14V , 15V , 16V , 18V , 19V
Output current

Note: when drawing more than 40 watts continuously the battery pack gives of significant heat. Provisions should be made for air flow or heat sinking if the battery is in a closed container.
5 Volt 4 amp continuous, 20 watts
5.5 Volt, 4 amps continuous, 22 watts
6 Volts 4 amps continuous, 24 watts
6.5 Volts, 4 amps continuous, 26 watts
7.5 volts 4 amps continuous, 30 watts
9 volts 4 amps continuous, 36 watts
10 Volts, 4 amps continous, 40 watts
11 Volts, 4 amps continuous, 44 watts
12 volts 4 amps continuous, 48 watts
15 volts, 4 amps continuous, 60 watts
16 volts, 3.75 amps continuous, 60 watts
4 amps for 5 minutes, 64 watts
18 volts, 3.3 amps continuous, 60 watts
19 Volts, 3.16 amps continuous, 60 watts
Equivalent Capacity 60 watt hours
Detailed Capacity
(double this capacity for the combination of MP3500-I plus MP3460)
11.7 AH at 5 volts
10.9 AH at 5.5 volts
9.9 AH at 6 volts
9.1 AH at 6.5 volts
7.8 AH at 7.5 volts
7.1 AH at 8.4 volts
6.4 AH at 9 volts
6.0 AH at 10 volts
5.4 AH at 11 volts
4.9 AH at 12 volts
4.6 AH at 13 volts
4.4 AH at 14 volts
3.9 AH at 15 volts
3.75 AH at 16 volts
3.3 AH at 18 volts
3.1 AH at 19 Volts
Output DC/DC converter efficiency 88% at 5V output, 93% at 19V output
Charging port Charge input is a 5.5 x 2.1mm barrel jack
Dimensions 3.28 x 6.8 x 0.92 inches (85 x 173 x 23.4 mm)
Charging time 3-4 hours using the 19V output AC charger included
USB Charge Port Yes, it puts out 5V no matter what the main output voltage is set to, essentially turning the pack in to a 2-voltage source.
Alarm There is an audio alarm that sounds when the battery is close to being empty. It sounds when the battery is 3% to 5% full and will sound until the battery shuts off.
Kit list Battery pack, charger, output cord, case, barrel adapters, barrel adapter storage
Charger Included is a universal AC input (100-240 VAC 50/60Hz) 19 volt 3.16 amp power supply that is used for charging. It has a 5.5 x 2.1 mm barrel connector. Charger dimensions are 67x31x106 mm.
The power supply has CE, UL, CCC, TUV.
Weight 440g, 1 Pound without the output cord
370 grams for the add-on pack
Output cord length 2 feet
Connector kit 7 barrel style adapters match thousands of products 2.35 Outside Diameter x 0.75mm Inside Diameter digital camera style
4.0 OD x 1.7mm ID
4.75 OD x 1.75mm ID
5.5 OD x 2.1 mm ID
5.5 OD x 2.5 mm ID
6.3 OD x 3 mm ID

(6.0 to 6.5)OD x 4.25 ID with 1.5mm center pin
Output socket information for engineers The output socket is a special 3-pin mini-din made by Kycon. If you need some mating connectors because you want to make your own cables the data sheet is here . They are readily available from Mouser.
Pin 1 positive
Pin 2 negative
Pin 3 switch--must be connected to Pin 2 to turn the power on
16 connector set available extra, click here.
If the connectors that are included don't have the one you need you can order this kit which has the 16 most popular connectors in it.

It also works with any of the connector adapters with 4 mm pin spacing such as this one that might be available to you locally.
Extra connectors
A picture of how the auxiliary battery attaches to double the capacity. The MP3500 with optional battery pack attached to  double its capacity
There is a 6-pin connector to link two batteries together with, such as the picture above. Here is the pinout. Normally you won't need this information. 6 pin connector for linking batteries together
MP3500 layout diagram

DC UPS configuration
DC UPS configuration. The power input can be the included AC adapter or any DC voltage between 9V and 24V, such as a car's cigarette lighter power point or solar panel.

This picture is on the back of the unit, showing how to adjust the output voltage:
dip switch settings for the MP3500I
Accessory Table
Typical run time calculations
Power Drawn from Battery(Watts = Amps*Volts) Continuous Running Time Time with MP3460
1 watt 60 Hours 120 hours
5 watts 12 Hours 24 hours
10 watts 6 Hours 12 hours
15 watts 4 Hours 8 hours
20 watts 3 Hours 6 hours
30 watts 2 Hours 4 hours
60 watts 1 Hour 2 hours

Voltage versus time discharge curves. You can see that, unlike plain batteries, the output voltage is precisely regulated until the battery runs out of stored energy. Chart showing that voltage output is very stable for all the voltages and the amp hours varies linearly with output voltage from 2.4 to 8.6 AH equivalent
You can see that unlike plain batteries this pack delivers exact regulated voltage until the pack runs out of juice. This is very helpful for instruments, cameras, thermal cameras, lights, and other applications that work best with regulated power. For comparison, most laptop batteries use 14.4 volts and 2.2 AH, so this can run a laptop longer than the built-in battery.

Many laptops can be run at lower voltage than the manufacturer's power pack would indicate, they just can't charge the battery at lower voltages. In this case it is a good idea to run the battery pack at 12 to 14 volts so no power is wasted charging the laptop's internal battery. However, you can't always use this trick, my ACER won't run at all unless I give it the full rated voltage.

Click here to download a quick-start PDF graphic manual that shows how to use these external battery packs.

Questions and Answers

Q: Is it legal to take these spare batteries on airplanes?

A: The PST-MP3500-I has about 3.2 grams of equivalent lithium, and the combination of the PST-MP3500-I and PST-MP3460 contain about 6.4 grams of equivalent lithium, so they are OK to take in carry-on luggage. See the government web page https://www.phmsa.dot.gov/safe-travel/batteries-safe-travel-flyer for more details.

Q: I have a 60 watt laptop, will this 50 watt battery pack work with it?

A: Yes, the 60 watts is the maximum that the computer can use, including charging the internal battery. For the most efficient use of the stored power it is recommended that the PST-MP3500-I be used when the laptop's internal battery is full or removed. Some computers will also run fine on lower voltage (12V, 14, or 16V) which will prevent the internal battery from being charged, if you don't waste energy charging the internal battery you will get you even more run time from the external battery pack. In addition the PST-MP3500-I can supply up to 60 watts when the laptop needs peak power.

Q: The AC charger that is included, is it a peak charger? So that it switches off the charging process when the battery is fully charged?

A: The charging circuit is actually built into the battery case. So the charger that comes with it is just a power supply. In fact any voltage between 9VDC and 24VDC can be used to charge it. The internal charger is a smart charger, it will not overcharge the battery. In fact when I am on a trip I leave the battery connected to the computer and run the "charger" into the battery. That way I only have to bring one power supply with me.

Field test:

December 2006. I have been using one of these packs since July of 2006, first on a trip to China and then on several smaller trips and also in the lab to create the curves shown above. It was very nice to be able to run my 60 watt Acer laptop as long as I could stand to work on the bus and the plane rides. You can also see the impressive voltage regulation and run time from the curves.

I have also been impressed that it will recharge from voltage sources as low as 9 volts, I have recharged mine at 5 volts, 9 volts, 12-14 volts (car cigarette lighter), at 14, at 16, 19, and even 24 volts. The data sheet now says 9V, because at 5 volts the charge rate is too slow for practical applications. I am sure that it will charge at any voltage above 9V and less than 24V. I have a little solar charger that I would like to try, but my office window faces north toward the mountains and I don't get much direct sun.

August 2007

I wrote a WordPerfect macro to time how long it took for the computer to shut down due to running low on battery power. Then I ran my Acer a couple of ways to measure how much more time the MP3500-I gives me.
Configuration Minutes Hours and minutes
Internal Battery alone 84 minutes 1 hour 24 minutes  
Internal Battery + MP3500-I 155 minutes 2 hours 35 minutes  
Internal Battery + MP3500-I + MP3460 226 minutes 3 hours 46 minutes  


Harry M: I would like to say that this is the BEST UPS appliance I've come across with and I'm very pleased with the product itself. I'm planning to buy more in the near future for other experiments.

Gary Z: I have a Celestron alt-az mount, and use the MP3500I to power it. This battery pack is awesome. I love using it.

Mary L: I have a portable photography set-up to photograph and digitize rare books. I use a MP-3500I to operate the LED floodlights, which require 9V. The steady voltage keeps the light level constant. Sagging illumination was a problem I had with the rechargeable batteries the lights came with.

Mark C: These power supplies have been doing a great job for us for several years now, supplying uninterruptible power to sensitive broadcast equipment. The OEM offered a battery pack but one can’t use it and charge it at the same time, so we bought Powerstream's MP3500.

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