Compact, capable, and travel-friendly — the HTRC P20 keeps your Sapphire Energy batteries ready to go. It supports both 12V and 24V systems across lithium (LiFePO4) and lead-acid chemistries with safe, microprocessor-controlled multi-stage charging.
Delivering up to 20A at 12V (10A @ 24V), it can recharge a 200Ah LiFePO4 battery in about 10 hours from empty (ideal conditions). Clip on the included alligator clamps, select the mode, and let the charger do the rest.
Why You’ll Love It
Automatic Voltage Detection – seamlessly works with 12V or 24V batteries
Right-Sized Power – 20A output for steady charging; use current limits for smaller batteries
Portable & Cool – lightweight design with temperature-controlled cooling fan
Versatile Modes – includes a forced charge function to re-activate deeply discharged lead-acid and wake up undercharged lithium packs
Long Power Cord – includes a full 10 ft (3 m) cord so you can often skip the extension cord
We use the P20 ourselves — it’s dependable, compact, and easy to throw in a service kit. The forced charge mode is especially handy for reviving lead-acid batteries and “waking” lithium packs that have fallen below BMS cut-off before switching back to normal LiFePO4 mode.
Perfect For
RV & Vanlife – top up house batteries on shore power or a generator
Off-Grid Cabins – maintain backup batteries during low-solar stretches
Marine / Boats – reliable charging for onboard lithium or lead-acid banks
Up to 300Ah (larger supported with extended charging times)
Dimensions
158 × 90 × 50 mm (6.22 × 3.54 × 1.97 in)
Weight
520 g
What’s Included
HTRC P20 Charger Unit
3 m (10 ft) AC Power Cord
Detachable Alligator-Style Battery Clamps
User Instruction Manual
Frequently Asked Questions
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.
It’s suitable up to ~300Ah 12V (~150Ah 24V). Larger banks are supported; charging times will extend accordingly.
Yes. Select the LiFePO4 mode for correct charge voltages and multi-stage control tailored to lithium iron phosphate chemistry. Just press the MODE button until the corresponding LED turns on.
Yes. Mode memory recalls your last used charging mode for quick setup next time.
Yes. Use the adjustable current limit to match smaller batteries or sensitive applications.
The fan is temperature-controlled and ramps as needed. It’s quiet in light loads and speeds up to manage heat during higher output.
Yes. An advanced repair mode helps address sulfation and restore performance on lead-acid batteries.
Generally yes for moderate loads, but charging will be slower. For fastest, most consistent charging, minimize heavy loads during the charge cycle.
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.
Reverse polarity, over-temperature, seasonal (summer/winter) compensation, and microprocessor-controlled multi-stage charging.
Has great clamps that are easy to connect to my car battery. Charged up really fast and I like that it also works for my lithium battery I use with my radio gear.
V
VanlifersBC
P-20 smart charger
Got my battery up and 100% charged. Nice little unit.
C
C.S.
Handy Charger
Easy to use and works good. Different modes are easy to use.
D
Daryl Kindred
Battery Charger
Russ was very helpful in finding the correct charger for the lithium. Phosphate batteries. Also the batteries safety , the amount of energy required to charge without damaging the battery and it's life.
D
Devon Davis
Powerfull battery charger. Is running now 5 days to load several lifepo4 battery packs. Good connector plugs, cable looks thick enough, case is stable. The fan is regulated automatic as the charger needs more cooling for higher load. Very cool switching the max amp via switch.
