12V LiFePO4 batteries and a 48V lithium charger under $400 compared

Two jobs: storing 12V power or charging a 48V bank

Stored energy is amp-hours times voltage: Victron's 12.8V batteries have four 3.2V cells, and its manual lists 1,280Wh for the 100Ah model and 3,840Wh for the 300Ah, three times as much ¹. Size the battery to your inverter as well. Battle Born recommends at least 100Ah of battery for every 1,000W of inverter, so a 3,000W inverter needs at least three of its 100Ah batteries ².

The ECO-WORTHY charger stores nothing, and "48V" is not one charging profile: Victron's settings for a 48V system built from its 12.8V batteries are 56.8V absorption and 54V float ¹, while Pylontech's 48V modules have 15 cells in series and Victron caps their charge at 52.4V ³. The ECO-WORTHY adjusts from 32V to 64V, defaults to 57.6V and lists LiFePO4, lead-acid, AGM and NCM batteries ⁴. Across 15 cells, 57.6V is 3.84V per cell, against the 3.55V per cell Pylontech's own BMS requests ³, so set the charger to your battery maker's figure, not the default.

1. Lithium NG 12,8V battery manual Victron Energy — Spec table: "Nominal voltage 12,8 V"; "Nominal energy @ 25 °C 1280 Wh … 3840 Wh" for the 100 Ah and 300 Ah models; a 12.8 V battery has "4 cells, each with a nominal voltage of 3.2V"; "Absorption voltage: 14.2 V for a 12.8 V lithium battery (28.4 V / 56.8 V for a 24 V or 48 V system)"; "Float voltage: 13.5 V for a 12.8 V lithium battery (27 V / 54 V for a 24 V or 48 V system)".
2. What Size Inverter Do I Need for My RV? Battle Born Batteries — "We recommend having a minimum of 100Ah battery for each 1000 watts of inverter capacity." "For example, a 3000-watt inverter would need at least three 100Ah Battle Born Batteries."
3. Victron & Pylontech UP2500, US2000(C/D), US3000, US3000C, US5000, US5000B, UF5000, Pelio-L, UP5000, Phantom-S, Force-L1 & L2 Victron Energy — "The 24V model is an 8-series configuration while the 48V model is a 15-series configuration." "The Pylontech battery requests a charge voltage of 53.2V." "The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell." "For this reason we opted to override the BMS and cap the voltage at 52.4V."
4. ECO-WORTHY 48V 60A Battery Charger For 48V LiFePO4 Battery | 3.2KW Max Output | 120V/240V AC Input ECO-WORTHY (Canada store) — Spec table: Charge Voltage (adjustable) "32-64V (default 57.6Vdc)"; Battery Type "LiFePO4/Lead-acid/AGM/LiNiCoMn".

Amp ratings are ceilings; cycle counts have conditions

A BMS amp rating caps how much current a battery will deliver; it says nothing about how much the battery stores ¹. Battle Born gives its own BMS a 100A continuous limit, which it equates to 1,200W at 12 volts, plus 200A for 30 seconds ¹, and it lists "BMS-triggered shutdowns" among the symptoms of an undersized bank ². RVPOZWER's FAQ cites a 200A over-current limit for its batteries without naming a 300Ah model ³, so confirm the figure for the exact battery before you buy an inverter.

The charger's 60A is a 240V number: ECO-WORTHY's spec table lists 0–60A at 240V input but 0–30A at 120V, with a 3.2kW maximum ⁴.

Cycle counts depend on depth of discharge and on the end point: Victron lists 2,500 cycles at 80% depth of discharge and 5,000 at 50%, counted until capacity falls to 80% of nominal ⁵. RVPOZWER's home page states "15K+" cycles at 60% depth of discharge ⁶. Without both conditions, two cycle claims can't be compared.

1. Frequently Asked Questions: What are the current limits of your BMS? Battle Born Batteries — "100 amps continuous (1200 watts at 12 volts)"; "this means you can pull 100 amps out of the battery when you need it until the capacity is all used up"; "200 amps for 30 seconds (2400 watts at 12 volts)".
2. How to Size an Inverter (And When Surge Limiting Is Needed) | The Battle Born Educational Series Battle Born Batteries — "If the battery bank is undersized, you may experience:" "Voltage drop", "Reduced performance", "BMS-triggered shutdowns".
3. Frequently Asked Questions RVPOZWER — The Smart BMS answer lists protection against "over-current (200A limit), and short circuits"; the FAQ names no specific battery capacity such as 300Ah.
4. ECO-WORTHY 48V 60A Battery Charger For 48V LiFePO4 Battery | 3.2KW Max Output | 120V/240V AC Input ECO-WORTHY (Canada store) — Charge Current (adjustable): "0-60A @240Vac, 0-30A @120Vac"; "Maximum charging power 3.2kW, charging current adjustable from 0-60A, and charging voltage adjustable from 32-64V."
5. Lithium NG 12,8V battery manual Victron Energy — "CYCLE LIFE (capacity ≥ 80% of nominal)": "80 % DoD 2500 cycles", "70 % DoD 3000 cycles", "50 % DoD 5000 cycles".
6. Rvpozwer Solar Panel & Lithium Battery | Pioneering Sustainable Energy Solutions RVPOZWER — Performance metric "15K+" labeled "Battery Cycles at 60% DOD"; battery card: "4000-15000 deep cycles, 15-year lifespan".

What to confirm before you order

Cold charging. Renogy says lithium batteries without self-heating "should not be charged when their internal temperature falls below 32°F (0°C)": cold charging can plate lithium onto the negative electrode, and that plating "is often permanent and can lead to internal short circuits" ¹. Victron's battery can be charged only between 5°C and 50°C (41°F and 122°F) ². RVPOZWER's FAQ says charging below 0°C "requires reduced current rates" rather than describing a cutoff ³. If the battery will sit in freezing weather, look for a spec sheet that lists a low-temperature charge cutoff.

Series and parallel rules. Victron allows at most four 12.8V batteries in series and notes that "the cell balancing circuits in one battery cannot affect the cells in another battery" ². RVPOZWER's FAQ allows up to four in series and four in parallel, all of the same model, age and state of charge ³. A battery with no published limits leaves you guessing.

Warranty. RVPOZWER's 10-year limited warranty covers batteries "purchased through authorized channels" and excludes "unauthorized resellers" ⁴, so ask the seller whether this listing qualifies.

1. Renogy Self-Heating vs. Low-Temperature Protection Lithium Battery Renogy — "These batteries should not be charged when their internal temperature falls below 32°F (0°C)" unless they have a self-heating feature; during cold charging lithium "can plate onto the negative electrode"; "This plating is often permanent and can lead to internal short circuits".
2. Lithium NG 12,8V battery manual Victron Energy — "The battery can be charged between 5 °C and 50 °C." "Connect a maximum of four 12.8V batteries or a maximum of two 25.6V batteries in series." "This is because the cell balancing circuits in one battery cannot affect the cells in another battery."
3. Frequently Asked Questions RVPOZWER — "LiFePO4 batteries function from -20°C to 65°C, though charging below 0°C requires reduced current rates." "Our batteries support series connections up to 4 units (48V nominal)" and "parallel connections up to 4 units (expanding Ah capacity)." "All batteries in a bank should be identical model, age, and state of charge when connected."
4. Warranty Policy RVPOZWER — "Rvpozwer provides a 10-year limited warranty on all solar panels, LiFePO4 batteries, … and mounting hardware purchased through authorized channels." Exclusions include "Products purchased through unauthorized resellers or second-hand markets".

What these prices mean

Each price here is the one we last checked on that product’s own page, and each page says the date. All three are AliExpress listings: AliExpress quotes new accounts a lower “Welcome deal” price and runs store coupons on top, so you may be shown less than we list, and the struck-through figures are the sellers’ own — each claims around 70% off, and we have not seen any of them charged. In our own record the MOSEWORTH dropped from $169.82 to $164.34 on October 9, the RVPOZWER from $408.29 to $395.12 on October 1, and the ECO-WORTHY has stayed at $237.59 since we started recording it on October 6, 2026.