Joe Friday was a fictional character of the Los Angeles Police Department in the TV series Dragnet. The storylines weeks after weeks were quickly forgotten however, one line of his dialog was constant week after week:
“Just the facts ma’am, just the facts “.
Thus, in keeping with Joe’s dialog when discussing truck campers options for batteries – deep cycle lead-acid, sealed absorbed glass mat (AGM), lithium-ion
“Just the facts”.
Truck camper’s lithium-ion batteries are typically 30% lighter (Battle Born LiFePO4 -31lbs) https://battlebornbatteries.com/shop/12v-lifepo4-deep-cycle-battery/) than deep cycle lead-acid batteries (Interstate Group 27 – 50 lbs) https://www.interstatebatteries.com/recreation-vehicles/marine-batteries/deep-cycle or a sealed absorbed glass mat battery (AGM) (Optima Blue Top D31M – 59.8 lbs) https://www.optimabatteries.com/en-us/bluetop-dual-purpose-deep-cycle-and-starting/d31m .
Important to truck campers – battery cycles. The number of cycles refers to the number of charges and discharges with one cycle being one time you fully discharge a fully charged battery. The average cycle for deep-cycle lead-acid and sealed absorbed glass mat batteries is 400 to 1,500 cycles. Lithium-ion batteries can last an average of 3,000 to 5,000 cycles
While the deep cycle lead-acid batteries have a constantly sloping voltage discharge. Lead-acid and AGM batteries have a shelf life. As a general rule, the less you discharge your battery, the longer it will live for.
If your battery is rated for 3000 cycles and is discharged one cycle by a third each day, you have 8 years of service (just an estimation). Should the discharge is by a quarter you get 9 years of service. If you don’t discharge at all you get 10 years.
The discharge curve of lithium batteries is essentially flat, meaning that a lithium battery at 20% will be providing nearly the same output voltage as it would at 80%.
Truck camper deep-cycle lead-acid batteries are less expensive than AGM or Lithium-ion batteries. Example: Interstate Deep Cycle Group 27 Battery, 80 Ah (amp hours), 12 volts, number of deep cycles not provided, cost per battery as of 5/15/20- $127.95.
A Duralast Platinum AGM battery – Group 25 – with 550 cold-cranking amps (685 cranking amps) – 12 volts – Amp-hours and number of deep cycles not provided – cost as of 8/27/20 – $199.99.
Battle Born LiFePO4 (Lithium-ion) Deep Cycle Battery – 100 Ah (amp hours), 12 volts with built-in BMS (Battery Management System), 3,000 – 5000 deep cycles, cost per battery as of 9/26/20 – $949.00.
Truck Camper Battery Charging
When charging a lead-acid battery, you can lose between 15-30% of the energy from your charging unit to the battery due to heat loss.
Charging an AGM it is best when it is low and slow. A low amp charger (one to 12 amps) is generally also the best choice for charging any lead-acid battery. It’s quicker to charge at a higher amperage, but it also can generate a lot of heat, which reduces the life of a battery, just like the heat of summer.
Webmaster’s comment – The table below was provided by RELiON, a manufacturer of Lithium-ion batteries. Thus, the figures may seem one-sided, biased, and prejudiced to say the least.
Lithium-ion batteries are 99% efficient and will accept nearly 100% of the power from your charger or solar panel(s). The batteries have 10 times faster recharging time in as little as 1 hour from a completely dead battery. This circuity is custom made for the battery thus increases its already expensive cost. If you have a 100 AH lead-acid battery and a 100-amp charger, it will take 1 hour to fully charge. Yet this type of battery cannot handle being, over-voltage, overcharged, and its discharge. One company, Battle Born LiFePO4 (Lithium-ion) Deep Cycle Battery protection circuity is BMS (Battery Management System). Another manufacturer, Smart Battery http://smartbattery.com, features an automatic built-in battery protection system (BPS) that keeps the battery running at peak performance and prevents overcharging.
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