A lead-acid charger never finishes a lithium battery · review

Guanlan 14.6 V 10 A, LiFePO4 only, three-stage review

A 14.6 V 10 A charger built only for 12 V LiFePO4 batteries, using a three-stage constant current, constant voltage and full charge sequence with a side cooling fan.

By Jean-Benoit Buisson

The bottom line A single-purpose charger that puts the number that matters in its name and delivers a charge time consistent with its own current. It says nothing about float voltage or cold weather, which are the two things that happen after the charge finishes.

A 14.6 V charger for LiFePO4 and nothing else.

What the model designation carries

14.6 V. Four LiFePO4 cells in series at 3.65 V each. That is the voltage a 12 V lithium pack is charged to, and putting it in the product name means the match can be checked against the battery’s own datasheet without opening anything.

Three stages, named

Constant current, constant voltage, full charge. That is the correct sequence, and naming the stages is more useful than claiming intelligent charging.

The arithmetic that holds

A 50 Ah pack fully charged in five hours at 10 A. Consistent with its own rating, which is worth noting on a shelf where charging claims frequently are not.

What happens after

Not stated. There is no float voltage and no description of what the charger does once the pack is full. For a lithium battery that matters less than for lead — LiFePO4 is not floated indefinitely — but a charger that stays connected is doing something, and the listing does not say what.

The cold

Nothing. Three LiFePO4 batteries in this catalogue refuse charge below 0 °C or −7 °C. A charger for that chemistry that says nothing about temperature leaves the question to the pack.

Availability

German, French, Italian and Spanish Amazon stores quoted 40 € to 50 € when this page was compiled.

American and British Amazon stores returned nothing at all, so the buy button there runs a search instead of landing on an empty page.

These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.

Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.

What it gets right, and what it leaves out

Strengths

The charging voltage is in the product name — 14.6 V — which is exactly what a LiFePO4 pack expects
The three stages are named: constant current, constant voltage, full charge
A stated full charge of a 50 Ah pack in five hours, which matches 10 A arithmetic

Compromises

No float voltage, so what it does after the pack is full is unstated
No low-temperature behaviour, on a charger for a chemistry that must not be charged cold
Single chemistry only, which makes it a second charger rather than a replacement

Specifications

Charge current	10 A, from the title
Absorption	14.6 V constant voltage stage, from the title and second bullet — published as the charging voltage
Float voltages	Nowhere in the listing — the third stage is described as a full charge phase without a voltage
Profiles	LiFePO4 only, for 12 V and 12.8 V packs, first bullet — no other chemistry is supported
Low-temperature behaviour	Nowhere in the listing
Connectors	Nowhere in the listing
Protections	Over-temperature, output over-voltage, over-current, reverse polarity, output short circuit and overload, fourth bullet
Amazon reference	B0GL6LPZ1H (same reference on 4 Amazon marketplaces)
EAN	0789044616315

Questions owners ask about this one

Why 14.6 V specifically?

A 12 V LiFePO4 pack is four cells in series, and 3.65 V per cell is the usual full-charge voltage — four times that is 14.6 V. Putting it in the product name means the charging profile can be checked against the battery maker’s figure before buying.

Does five hours for a 50 Ah pack make sense?

Broadly. 50 Ah at 10 A is five hours of bulk charging if the pack starts empty, before any tapering. The listing’s figure is consistent with its own current rating, which is more than can be said for several claims on this shelf.