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As folks who love and use batteries for many of the activities we enjoy as well as to maximize efficiency of our home we know the most important feature in energy storage is REAL CAPACITY!

Lead Acid batteries and Lithium batteries follow different standards for rating capacity, many Lithium battery sellers use a nice marketing term called "Lead Acid Equivalent" when discussing capacity.  This is partly to aid in a more apples-to-apples comparison with the "competitor" (Lead) but it is also partly to make claims that their capacity sound like more than it really is.  At Ohmmu we made the decision up front that we would never fall into this marketing trick and we give our capacities in what we call "REAL Ah".  

Lead Acid batteries are tested for capacity at a C/20 rate (battery should be rated at a load that will drain it from FULL to EMPTY in 20 hours time), in other words this is about a 5% load on the battery (100Ah battery, load it at 5A).  This is a very light load, since the battery isn't working very hard it will store more energy and provide better test results.

The Real Ah for a Lithium battery should be tested at a C/5 rate (should be rated at a load that will drain it from FULL to EMPTY in 5 hours time), in other words this is a bout a 20% load (100Ah battery, load it at 20A).  At this higher amperage all batteries (any chemistry) have less capacity (and it gets worst as you charge/discharge even faster).  Our Gen 2 Group 31 battery provides an astonishing 150Ah of energy when loaded this way while competing products we've tested from "other" LFP providers barely even reach 90Ah and any AGM/Lead Group 31 will definitely not even reach 90Ah.  A good comparison test for AGM/Lead is to look at the "Reserve Capacity" (it should be rated in minutes at 25A load), for a Group 31 claiming a 100Ah capacity RC should be at 240minutes (240min = 4hrs, 4hrs*25A=100Ah).

To provide the world the best product and the most utility we have chosen to focus on our Gen 2 Group 31 with its huge capacity because we believe anyone looking for an LFP Deep Cycle battery craves MORE capacity!

These batteries are the best you can install for Boats, RV's, Overlanders, Solar Energy Storage, Back-Up power and a myriad of other energy storage use cases (especially when mobility is factored in due to the light-weight).

Here is an example use case; 30' Diesel pusher with an 9kWh battery bank:

Trojan 31-AGM (


Ohmmu Gen 2 Group 31 (

Client requirement is 9kWh @ 10hrs rating (900W load runs for 10hrs continuously)

 12V system (750Ah)

Trojan 31-AGM 10hr Rate is 92Ah, Weight is 67lbs

Ohmmu Gen 2 Group 31 10hr Rate is 150Ah, Weight is 35lbs

750Ah / 92Ah = ~8 Trojan batteries, 536lbs

750Ah / 150Ah = ~5 Ohmmu batteries, 175lbs 

In this case the system can have 3 less batteries (taking up less precious space) and weigh in at just 33% of the weight, 1/3 of the weight!  Save 350lbs of weight with Ohmmu!

The benefit can be even more dramatic in vehicles like a Sprinter Chassis van, the House-Battery space only holds 1 unit and it is a Group 31 size, you get 50% more energy by changing to an Ohmmu Gen 2 Group 31 and reduce 30lbs of weight to boot!

(not to mention lasting 3x longer!!!)

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