Battle Born BB5012

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DISCONTINUED: Battle Born BB5012 Lithium, 12V deep cycle Lithium-ion battery, 50 Ah, 3000+ cycles, 8+2 years warranty

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SKU: BBN-188-101 Category: Tags: , , ,

This is one of our best-sellers! Finally a (more) affordable Lithium-ion battery, made by Battle Born, a Reno, Nevada, based company. Also see our Finding Happiness with Lithium-Ion article, explaining the care and feeding of these batteries.

Just 1/3 the weight of lead-acid, zero maintenance, and thousands more cycles vs. lead-acid. Battle Born Batteries offer an economic alternative when space and weight matter, such as for boat trolling motors and RV applications.

Battle Born lithium-ion batteries are true deep-cycle batteries, they can repeatedly be discharged a full 100% without damage. The battery has a build-in battery management system (BMS). The BMS allows them to be charged with regular solar PV charge controllers, with the same settings as for any other sealed battery (such as AGM batteries). The BMS also takes care of protecting the batteries from over- and under-charge, low Voltage disconnect, over-current, and automatic balancing of the cells.

Charge settings for Battle Born batteries:

  • Bulk/absorb = 14.2 – 14.6 Volt, with 14.4 Volt ideal
  • Absorb time = about two hours, or until the current drops to 5A or less.
  • Float = not needed, set to 13.6 Volt or less
  • No equalize, or set to 14.4 Volt if it can’t be disabled
  • No temperature compensation, set to 0
  • Charge rate of 25 – 30A or less is preferred for longevity, though up to 60A is possible
  • Battery has to be warmer than -4 Centigrade (25F), or the BMS will not allow charging, discharge works fine up to -20C (-4F)

The maximum discharge rate is 60 Amp continuous, 100 Amp for 30 seconds, and far more for 1/2 second.

Battle Born batteries can be connected in series and parallel to increase the bank Voltage and Ah rating. For example, two BB5012 batteries in series will make a 24 Volt / 50 Ah battery bank. Two in series and two in parallel will make for 24 Volt / 100 Ah etc. Any number of batteries can be connected in series/parallel, as long as overall battery bank Voltage is 48V or less (so no more than 4 in series). Parallel strings of batteries will increase the charge and discharge rates (i.e. 100A for two parallel strings etc.). Ask us if you have any questions about properly sizing a battery bank.

Battle Born batteries use LiFePO4 chemistry (Lithium-Iron-Phosphate). This is very stable and is not sensitive to spontaneous combustion, in comparison to laptop and cell-phone lithium-ion batteries (which use Lithium-Cobalt-Phosphate chemistry). The cells have build-in protection for over-pressure, over-temperature, contain a fire-retardant in the electrolyte and casing, and have a stainless steel jacket. These are very safe batteries!

Because lithium-ion batteries can be discharged to 100% DOD, and this can be done for more cycles, a smaller battery bank can suffice vs. lead-acid. Since there is no off-gassing these batteries can be mounted indoors.


  • Zero maintenance!
  • No memory effect
  • Compatible with standard charge controllers
  • 12 Volt, 50 Amp hour @ 20 hr discharge rate
  • Only 1/3 weight of lead-acid & small footprint!
  • Very low self-discharge rate, holds charge up to 1 year
  • Can be mounted in any orientation, zero off-gassing, no dangerous acid
  • Active cell management through included battery management system (BMS)
  • Long lifespan, true deep-cycle: 3000 cycles at 100% DOD, more if discharged less
  • 8 years full warranty, plus 2 years pro-rated, total 10 years warranty
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Weight 32 lbs
Dimensions 14 × 8 × 10 in

Mnfr. model

Battery type

Battery Voltage

Amp-hours (20-hour)






1 review for Battle Born BB5012

  1. Taras

    Purchased for my Tarpon 120 kayak to be used for a custom trolling motor install. Very happy with my purchase! Great customer support/service as well!

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