Victron Smart Lithium-Ion 100 Ah Battery LiFePO4 25.6V

Space- and weight-saving batteries with lithium iron phosphate technology from Victron

Why lithium iron phosphate?
The lithium iron phosphate (LiFePO4 or LFP) battery is the safest of the regular lithium-iron battery types. The nominal voltage of an LFP cell is 3.2V (lead-acid: 2V/cell). A 12.8V LFP battery therefore consists of 4 cells connected in series and a 25.6V battery consists of 8 cells connected in series.

Robust
A lead-acid battery will fail prematurely in the following cases due to sulfation:

• If it is operated for a long time in an insufficiently charged state (i.e., if the battery is rarely or never fully charged).
• If it is left in a partially charged or, even worse, completely discharged state (yacht or motorhome during the winter).

An LFP battery does not need to be fully charged. Its service life is even slightly increased if the battery is only partially charged instead of fully charged. This is one of the major advantages of LFP batteries compared to lead-acid batteries.
Other advantages include the wide operating temperature range, excellent cycle performance, low internal resistance, and high efficiency (see below).
The LFP battery is therefore the best choice for demanding applications.

Efficient
For numerous applications (especially off-grid solar and/or wind power systems), the energy utilization rate can be of crucial importance.
The energy utilization rate of a charge cycle (discharging from 100% to 0% and recharging to 100%) of an average lead-acid battery is approx. 80%. The energy utilization rate of a charge cycle of an LFP battery is, on the other hand, 92%.
The charging process of a lead-acid battery becomes inefficient especially when the 80% state of charge mark has been reached. This leads to energy utilization rates of only 50%.
In solar systems, this value is even lower, as energy reserves for several days are required there (the battery is operated in a state of charge between 70% and 100%).
An LFP battery, on the other hand, still achieves an energy utilization rate of 90%, even when it is in a shallow state of discharge.

Size and weight
Space savings of up to 70% weight savings of up to 70%

Expensive?
LFP batteries are expensive compared to lead-acid batteries. However, the higher purchase costs will more than pay for themselves in demanding applications due to the longer service life, high reliability, and excellent energy utilization rate.

Bluetooth
Cell voltages, temperature, and alarm status can be monitored via Bluetooth. This is very useful for detecting a (possible) problem such as cell imbalance.

Battery Management System (BMS)
The BMS can be connected to the BTVs and its most important functions concern:

• interrupting or switching off the load if the voltage of a battery cell drops below 2.5 V.
• stopping the charging process if the voltage of a battery cell rises above 4.2 V.
• switching off the system if the cell temperature exceeds 50 C.

Victron LFP batteries feature integrated cell balancing and cell monitoring functions. Up to ten batteries can be connected in parallel and up to four batteries in series, allowing a 48 V battery bank of up to 3000 Ah to be assembled. An example connection can be found in the product images. The cables of the cell balancing/monitoring function can be daisy-chained together and must be connected to a battery management system (BMS).