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Gerbing 12V FlexPack Battery
  • Gerbing 12V FlexPack Battery
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Gerbing 12V FlexPack Battery Videos

Gerbing 12V 128FP FlexPack Battery

To power the new line of Gerbing jacket liners, Gerbing has developed a new, thin, "FlexPack" battery, designed to slip into the back pocket of the jackets. The Gerbing Flex Pack Battery is flexible and can shape itself to the gentle curve of your back. Its individual cells are wrapped in an abrasion-resistant Kevlar layer, and the long battery lead makes connecting easy. Plus the FlexPack Battery features a wireless remote control with 3 heat levels and the capability to recharge while riding or from an AC wall plug.

Integrates seamlessly with the Gerbing 12V Heated Jacket Liner.

The 128FP Battery Kit comes complete with FlexPack Battery, wall charger, one remote control, and Gerbing's Intelligent Power Management Control (IPMC). The IPMC works only with the 128FP battery and serves multiple functions.

  • It receives and processes the control signals from the remote controller
  • It directs power from the battery to the jacket when you're not connected to a bike
  • And it directs bike power to the jacket when connected to the bike, and simultaneously directs power back to the 128FP battery to recharge it as you ride


  • 13.25" x 8.75" x 0.875"

Note: Flex Pack Battery is intended for use with a jacket liner only with a total power output of 10 amps and will not work with Gerbing portable or permanent temperature controllers.

WARNING: It is important that you charge your battery regularly and that you maintain at least 25% of your battery power when not in use or left idle. Batteries must only be used with products with an amp rating less than the maximum capacity output rating for the battery. In the case of Gerbing's 128MV and 128FP batteries, that would be a maximum discharge rate of 8amps. Lithium-polymer battery packs can be recharged at state of discharge, without memory effect.

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Gerbing 12V FlexPack Battery 3 5 3 3
Lazy design work I'm not knocking them any points for the size and weight of the pack. They're using the right battery technology, and I wouldn't want the battery life to be any less than it is... so heavy or not, it needs to be. It is what it is. The thing that chaps me is how badly the simple things were done. The battery and control module connect through two pigtail cables of roughly the same length. This puts the connection between the (separate# battery and control module zipper pockets #essentially inside the jacket shell#. This makes charging it a totally unnecessary pain in the butt. If one pigtail was longer, the connector could live in one or the other zipper pocket. Simple. Lastly, the control module has two buttons so you can use it if you misplace the remote. Good idea - terrible design. The buttons sit high off the housing and are very easy to push. This means when you put it on, take it off, hang it with your other coats, or brush up against just about anything, it turns itself on. When you take it out of the closet to wear, the battery is dead. It happened to me too many times, and now I'm always hitting the off button on the remote to make sure it didn't turn itself on #usually the lowest setting, so you wouldn't notice it#. If whoever designed this made a cardboard mock-up, they would have known the pigtail problem. Lazy. The control module just needs a re-spin ...and for how much these things cost, we should all be sent a replacement! I design products for the military, and this kind of shabby design work frosts me #literally, in this case). I recommend the product because it's super nice to be warm. But if there were any other options, I'd take 'em. February 21, 2015
Great battery life to keep toasty in the cold I bought this battery pack for my daily commute on an xr650L which does not have the power to handle the Gerbing 12v troller for my gloves. It works perfectly for my commute (2 hours a day) for powering my Gerbing 12v gloves at full power. The remote key fob is a nice feature, but I still opt to use the analog heat troller with a dial since it's smaller and can fit in a jacket pocket. Battery is about the same size as a large note pad, fits easily in a backpack with just enough of a lead to stick out of a zipper to connect to your jacket or whatever you are wanting to power. My only gripe is I wish the lead was half a foot longer, but I realize a lot of people will buy this as the insert for their jackets and won't need an extra long cord. January 27, 2014
Great all in one unit. I have been using this for a month now and have figured out the in's and out's about it. First thing ! if you have a gerbing product and use a controller you wont need it . this unit has a controller with it so all you need on the bike is the power cord. Recommend buying a 24" extension cable to go from the battery pack to the ipmc in the zippered pouch #if you have a liner jacket# and a Y splitter if you running pant's # you can only plug jacket to ipmc due to 6 amp max# pants will be full heat this way. The battery will keep you warm walking around for an hour or so based on setting. There are many way's to connect it so if you have a controller already you can use it and when you get off the bike you just switch the connecter to the battery pack. BTW there is buttons on the ipmc to turn it on and off without the remote. So far I have used it about 30 times in the house, walking to the park , riding bike to the coast and walking on the beach "WARM" plug back into the bike and staying warm while the battery pack charges back up. all and all the only complaint I have is the weight on my back it's not bad just like wearing a back protector. But you can take it out and still use the ipmc hooked to the bike normally . March 12, 2013
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Have a functionality, fit, or otherwise product-specific question about the Gerbing 12V FlexPack Battery? Ask it here! If you have a customer service or shipping question, please direct it to our Customer Service department.

Gerbing 12V FlexPack Battery
Already Asked: 7 Questions, 14 Answers
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RevZilla Store asked: Why did you choose this?
Stephen B: To use with jacket liner. Never be cold again, on or off the bike. Nov 30, 2013
A shopper asked: How much time does it take to charge a battery that comes with the vest? I am camping so electricity is limited Apr 29, 2014
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Arthur S: 4 hours on ac when dead. The bike will trickle charge while riding but not much. Leave it plugged into bike while riding when not in use, this will help. Apr 30, 2014
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Edmond Y: Take up to 5 hours to full charge. and the green light on the charger come on. May 1, 2014
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Shawn M: I haven't used it for a while but if I remember correctly about 5 hours Apr 30, 2014
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John H: A full charging cycle will require 6-8 hours. Apr 30, 2014
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Dennis A: From dead...it takes 3-4 hours Apr 30, 2014
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John C asked: Can the remote included with this battery be used as a temperature controller for heat that is drawn from the bike's battery also? Or put another way, if I bought this battery kit with the remote, would I still have to buy a gerbings temp controller? Nov 20, 2014
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Alex W: Hi John,

It comes with a temperature controller that gives you 3 setting;

Setting 1 is very mild heat good for about outdoor 40F.

Setting 2 is the most useful setting, I use it the last 2 days in NYC at 20F, I hand is nice and warm.

Setting 3 I don't know what that setting is for, it so hot it almost burn you.

I mostly use the battery pack when I am on a 3 mile walk thru midtown Manhattan, I use 1 of the output for the gloves and 1 for the jacket. Let me tell you, it was a COLD winter 2013 - 2014, with the battery pack I was nice and warm.

Yes, the temperature controller can be use on the bike battery the same way as it is on the battery pack, however, if you are only going to use it on the bike, the dual temperature controller will serve you better at half the price. I just brought one yesterday for the following reason....

You hands is always going to be 10 degree colder than your chest, so you will need to have your gloves dial up much more than the jacket.

FYI: Check out the Gerbing EX Heated jacket. It is beyond, its warmer than my Moncler coat without the heater turn on.

Best of luck
Nov 20, 2014
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Andrea Y: The battery kit controller can draw current from your bike and the battery simultaneously. However, it has only one coax output wire so it will not permit you to have independent control of jacket and gloves. Nov 20, 2014
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Arthur S: Yes, all you need to do is hook 12 volt lead to battery the remote controls the heat. No extra add on temp controller needed. Note you cant hook pants to it too much load jacket only. Nov 20, 2014
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A shopper asked: Can this device run both the Liner & gloves at the same time? Sep 19, 2014
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John B: The label right on the battery says, "Do not exceed a maximum 126Watt(10Amps) draw. Failure to do so may cause battery to overheat and damage the battery pack." It is also restated on the Revzilla web page advertising the battery pack in both a note and a warning. I'd say as long as the total draw of amps doesn't exceed 10 then you will be fine. With that said, the jacket takes 6.4 amps and the gloves take 2.2 amps. Adding these two I come up with 8.6 amps for the total draw with both the jacket and the gloves. My conclusion would be that you can run both the gloves and the jacket simultaneously from the battery. I haven't tried it yet but I don't think it would pose any problem. Nov 18, 2014
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Alex W: Yes, I have it running on both device at the same time, but it only last 45minutes on mid setting, 1+hour on low setting, 30+ on high,
FYI: unless you are out in 5-10 degrees weather, high will burn you.
Sep 19, 2014
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Robert F: I bought it hoping to run gloves and a jacket. Only to find out directly from Gerbings that the controller wasn't designed for that load and will not work. It can do one or the other but not both. Sep 19, 2014
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A shopper asked: What is the weight of this battery pack? Apr 9, 2015
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Dennis A: 3-4 lbs...but you wear it so you don't really notice. Awesome device. Apr 9, 2015
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A shopper asked: Will this battery pack also work to power other heated liners like the Powerlet Rapidfire? Mar 29, 2014
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Arthur S: Yes it will. Any 12 volt system The controller power supply ( the 12 v supply from the bike ) has to be directly attached at batt 12 volts. When using just jacket and batt it will work the same as long as you don't use the powerlet controller . Mar 29, 2014
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A shopper asked: Approximately how long will the battery run their 12V jacket liner for? I'm thinking of using it for camping this winter. Nov 21, 2014
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Product Style RevZilla Item # Manufacturer Product # Availability
Gerbing 12V FlexPack Battery 811392 BATLI128FPKT In Stock: Ships within 24 hours