Whether you are a slide in camper manufacturer or an enthusiast, the topic that comes up most often is electricity — and it is also where people spend the most effort. A slide in camper's power system has its own unique characteristics that differ from residential electricity, making it easy to fall into common misconceptions.

Today, we will walk you through the five biggest myths about using lithium batteries in slide in campers. Let's see how many of them you have fallen for!

Myth 1: Do Lithium Batteries Need to Be "Activated" Before First Use? Wrong!

When it comes to "activating" a newly purchased lithium battery, the familiar advice goes: the first charge must last over 12 hours, repeated three times to activate the battery. This claim of "charging for 12+ hours for the first three cycles" is simply misleading! It is actually a carryover from the days of nickel-based batteries (such as NiCd and NiMH), wrongly applied to lithium-ion batteries! As mentioned earlier, overcharging can cause internal pressure to build up inside the lithium battery or trigger an internal short circuit, leading to thermal runaway. Always charge according to the standard time and method — never exceed 12 hours of extended charging. On a side note, newly manufactured lithium batteries do indeed require activation, but this process is completed at the factory and has nothing to do with the consumer, nor does the consumer have the means to perform it. However, from the time a new lithium battery leaves the factory, goes through distribution, and reaches the consumer, a certain period will have passed — a month, several months, or even longer. After being idle for a while, a lithium battery enters a dormant state where the electrode materials become "passivated." At this point, the capacity falls below normal levels and usage time is accordingly shorter. Simply go through 3 to 5 normal charge-discharge cycles, and the battery will return to its full capacity. Lithium batteries have virtually no memory effect, so consumers do not need to worry about "activation" at all — let alone any special "activation" methods or devices.

Myth 2: Does the Charger Automatically Stop When the Battery Is Full? Wrong!

With a properly manufactured, certified lithium battery, the charger will generally stop charging automatically once the battery is full. There is no so-called 10-plus-hour trickle charging like with nickel battery chargers. In other words, leaving a fully charged lithium battery on the charger is just wasting electricity. It is important to remind everyone, however, that no one can guarantee that the battery's charge-discharge protection circuit will remain perfectly stable and flawless forever. Therefore, you should disconnect the power promptly once the battery is fully charged. Otherwise, the lithium battery will be perpetually on the edge of danger — another reason against extended charging. Additionally, with a small number of lithium batteries, if the charger is not disconnected after a certain period, the system will not only fail to stop charging but will actually begin a discharge-then-recharge cycle. Perhaps some manufacturers have their own reasons for this behavior, but it is clearly detrimental to the battery's lifespan. Furthermore, if extended charging is done at night, the voltage in many areas tends to be higher and more unstable during nighttime hours. Lithium batteries are more delicate compared to nickel batteries, with significantly less tolerance for voltage fluctuations during charging and discharging, which introduces additional risk.

Myth 3: Should You Wait Until the Battery Drops Below 20% Before Recharging? Wrong!

"Lithium batteries need activation, lithium batteries need full charge-discharge cycles, lithium batteries have a memory effect," and so on... It is precisely because of these misleading claims that people end up with the harmful practice of draining the battery below 20% before recharging — or even running it completely flat or waiting for automatic shutdown before charging! As mentioned earlier, over-discharging is one of the external causes of thermal runaway in lithium batteries, and its potential dangers are often overlooked and underestimated. While over-discharging does not alter the structure of the battery's active materials and early-stage over-discharge is unlikely to trigger thermal runaway, it does affect battery capacity and accelerates aging. Over time, this can lead to severe internal short circuits and cause the battery to heat up abnormally. Attentive campers may notice that once some batteries drop below 50%, the power depletion rate becomes astonishingly fast — plummeting almost instantaneously to an almost unimaginable degree! In theory, a 100Ah battery can supply 1A of current for 100 hours, or 100A of current for 1 hour. But theory is just theory. In actual use, performance is influenced by many factors, including the battery's true capacity, current draw, ambient temperature, and line losses. Dropping below 20% charge puts the battery into an over-discharge state. Experienced campers never let the charge level fall below 50% — meaning 50% is the threshold for lithium battery discharge. Even in the most power-hungry situations, you should never let it drop below 20%.

Myth 4: Does One Charge Equal One Cycle? Wrong!

As mentioned earlier, lithium batteries have a cycle life. NMC (ternary) lithium batteries have a theoretical lifespan of approximately 2,000 cycles, but by around 1,000 cycles, their capacity degrades to 60%. LiFePO4 (lithium iron phosphate) batteries, on the other hand, still retain 80% of their capacity after the same number of cycles. Many campers, in an effort to conserve these limited and precious cycle counts, deliberately wait until the battery drops to 10%-20% — or even runs completely flat or shuts down automatically — before recharging. This is a complete misunderstanding of the "cycle" concept in battery charging. In reality, a charge-discharge "cycle" for a lithium battery means draining the battery from 100% down to 0%, then recharging it back to 100%. That constitutes one complete 100% discharge-and-charge "cycle" — at which point the cycle count is 1 and the charge count is also 1. Note, however, that if you use a fully charged lithium battery down to 40% and then recharge it to 100%, you have only completed 0.6 of a "cycle"! And if you use it down to 60% remaining before recharging to 100%, that is only 0.4 of a "cycle"! These 0.6-cycle and 0.4-cycle sessions add up to one complete charge-discharge "cycle" — at which point the cycle count is 1, but the charge count is 2. In other words, one complete 100% charge-discharge cycle can involve just 1 charge, or it can involve 2, 3, 4, or even 5 charges. What ultimately determines a lithium battery's lifespan is the number of cycles, not the number of charges. Therefore, based on the material characteristics of lithium batteries, shallow charging and shallow discharging help slow down the rate of capacity degradation. In other words, lithium batteries should be charged as you use them — letting the battery "graze" with frequent small top-ups is healthier than draining it completely before each charge.

Myth 5: For 12V, 24V, and 48V Systems, Is Higher Voltage Always Better? Wrong!

As everyone knows, electrical power = voltage × current. For a given power output, voltage and current are inversely proportional — the higher the voltage, the lower the current. However, when current flows through a conductor, some power is lost as heat. The greater the current, the more heat is lost, and the lower our energy efficiency becomes. Conversely, higher voltage means higher energy efficiency. Therefore, from an efficiency standpoint, a 48V power system is more efficient than a 24V system, a 24V system is more efficient than a 12V system, and a 48V system is far more efficient than a 12V system. But when it comes to 12V, 24V, and 48V power systems, higher voltage is not necessarily better! OSHA (Occupational Safety and Health Administration) sets the safe voltage limit at 50V (AC). In wet environments, the recommended safe voltage should not exceed 24V. Clearly, a 48V power system is already approaching this safety limit, posing potential electrical safety hazards for ordinary consumers. Therefore, the industry generally agrees that safe voltage should not exceed 36V, continuous-contact safe voltage should be 24V, and safe current is 10mA. In wet environments, even 24V can pose electrical hazards. This makes 12V the safest and most practical option — which is likely why early automobiles were designed around 12-volt systems. Most automotive alternators are 12V, making it easy to charge 12V batteries directly. For 24V and 48V batteries, however, you would need to install additional regulator-rectifiers or modify the alternator. Moreover, the majority of vehicle appliances currently run on 12V. A 24V or 48V power system would need to step down the voltage to 12V through a regulator-rectifier for these appliances to work — a process that wastes the slide in camper's precious electrical energy. Additionally, higher voltage demands better insulation materials to prevent dielectric breakdown. This is especially critical for slide in camper equipment used outdoors, which is constantly exposed to wind, rain, and intense solar radiation — making the cost of adequate insulation materials a significant expense. So, having read all this, do you still simply believe that higher voltage is always better for a slide in camper's power system? We need to evaluate each situation on its own merits. As the old saying goes: the best choice is the one that suits your needs!