Does it have a dedicated LiFePO4 mode?

Yes. Select the LiFePO4 mode for correct voltages and multi-stage control tailored to lithium iron phosphate.

The fan is load-dependent and notably quiet compared to many chargers; it ramps only when needed.

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Sapphire Energy

36V / 48V SMART Battery Charger

Q: Can the P35 wake up a lithium battery that’s below cut-off?

Yes. Use the built-in forced charge function to safely “wake up” undercharged LiFePO4 batteries that have tripped their BMS cut-off. Monitor closely and switch to the normal LiFePO4 mode once the pack reaches a healthy voltage.

Q: What size batteries can it charge?

It is suitable up to roughly 400Ah at 12V or ~200Ah at 24V. Larger banks are supported with longer charge times or reduced current settings.

Q: Will it remember my last mode?

Yes. Mode memory recalls your last used charging mode for fast setup next time.

Q: Can I limit current for smaller batteries?

Yes. You can adjust the current limit to suit smaller batteries or sensitive applications.

Q: Does it have repair/desulfation for lead-acid?

Yes. An advanced repair mode helps address sulfation and restore performance on lead-acid batteries.

Q: Can I use it with a generator?

Yes — as long as the generator provides stable AC within 100–240V at 50/60Hz. For best results use an inverter generator, allow it to stabilize before connecting, avoid overloaded or unstable outputs, and use a proper-gauge extension cord with short runs.

Q: What protections are included?

Reverse polarity protection, over-temperature management, seasonal (summer/winter) compensation, and microprocessor-controlled multi-stage charging.

$134.95 CAD

~~$134.95 CAD~~ $134.95 CAD

Sale Sold out

HTRC P3648 Battery Charger

A powerful, versatile, and portable charger — designed to keep your Sapphire Energy batteries in peak condition. The HTRC P3648 works with both 36V and 48V systems, covering lithium (LiFePO4) and traditional lead-acid battery types. Built-in multi-stage charging profiles ensure safe, efficient, and worry-free charging every time.

With up to 18A @ 36V and 13A @ 48V, you can recharge golf carts, marine batteries, and solar power systems. Quick & Safe, just clip on the heavy-duty clamps, select your voltage, and let the microprocessor do the rest.

Why You’ll Love It

Fixed Voltage Switch – reduces risk of accidental overcharge by setting the voltage of your bank easily via switch.
Safe & Smart – microprocessor controlled, reverse polarity protection, and seasonal compensation for lead charging.
Powerful Output – charge large batteries quickly, or set current limits for smaller ones
Portable & Quiet – lightweight design with load-dependent cooling fan
Versatile Modes – includes a forced charge function to re-activate dead lead-acid batteries and wake up undercharged lithium packs
On/Off Switch & Fuse – Safety & Simplicity of operation.

This is the latest in a line of charger products that has wowed us — it’s compact, reliable, and noticeably quieter than many comparable chargers. It also features a XT60 output port for maximum flexibility with external adapters.

Perfect for the shop, garage, or to keep in your travel kit. The built-in forced charge mode is especially useful: it can revive heavily discharged lead-acid batteries and safely “wake up” lithium batteries that have fallen below their BMS cut-off voltage.

Perfect For

Golf Carts – Keep your golf cart batteries charged and ready to go!
Off-Grid Cabins – keep backup batteries topped up during low-solar periods using your generator
Marine / Boats – safe and reliable charging for onboard lithium or lead-acid banks
Workshop & Garage – maintain or repair batteries for electric ATVs, Golf Carts, Lawn Tractors, Scooters, etc.
Emergency Backup – revive dead lead-acid or wake up lithium packs when you need them most with a forced charging mode
Travel & Service Kits – lightweight and portable, ideal for remote work or field service

Specifications

AC Input	100–240V (50/60Hz), 650W max
DC Output	36V (18A max) / 48V (13A max)
Supported Batteries	LiFePO4 / Lithium / Lead Acid (AGM, GEL, EFB, MF, Flooded, VRLA, SLA)
Minimum Start Voltage	>26V
Suggested Capacity	Up to 300Ah (larger supported with extended charging times)
Dimensions	230 × 125 × 70 mm (9.05 × 4.92 × 2.76 in)
Weight	1.0 kg (2.2 lbs)

What’s Included

HTRC P3648 Charger Unit
2m AC Power Cord (Detachable / Replaceable IEC C13)
Replaceable Heavy-Duty Alligator Clamps (XT60 Connector)
User Instruction Manual

Frequently Asked Questions

Can the P3648 wake up a lithium battery that’s below cut-off?

Yes. Use the built-in forced charge function to safely “wake up” undercharged lithium (LiFePO4) batteries that have tripped their BMS cut-off. Monitor closely and switch to the normal LiFePO4 mode once the pack reaches a healthy voltage.

What size batteries can it charge?

It’s suitable for any size 36V or 48V bank; However the charging times will extend to match the size.

Does it have automatic voltage detection?

No. To avoid accidentally detecting a wrong battery voltage, there is a dedicated switch to select between 36V and 48V charging profiles.

Can you adjust the charging current?

YES.To avoid boiling a smaller battery, you can select from several current settings using the MODE button on the front of the charger.

Will it remember my last mode?

Yes. Mode memory recalls your last used charging mode for quick setup next time.

Can I limit current for smaller batteries?

Yes. Use the adjustable current limit switch to match smaller batteries or sensitive applications.

Is the fan loud?

The fan is load-dependent and notably quiet compared to many chargers we’ve tested. It ramps up only when needed.

Does it have repair/desulfation for lead-acid?

Yes. An advanced repair mode helps recover performance in sulfated lead-acid batteries.

Can I charge with loads connected?

Generally yes for moderate loads, but charging will be slower. For fastest, most consistent charging, minimize large loads during the charge cycle.

Can I use it with a generator?

Yes — as long as the generator provides stable AC within 100–240V, 50/60Hz. For best results use an inverter generator, let it warm up and stabilize before connecting, avoid overloaded/unstable outputs, use a proper-gauge extension cord, and keep cable runs short.

What protections are included?

Reverse polarity, over-temperature, seasonal compensation (summer/winter), and microprocessor-controlled multi-stage charging.

Will it work on 120V and 240V AC?

Yes. Wide-range input: 100–240V AC, 50/60Hz.