Golf cart lithium chargers: voltage first, then amps
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When you swap a golf cart to lithium or used EV modules, the stock lead-acid charger usually has to go. Its charge profile was built for flooded batteries, and on a custom pack its final voltage may be wrong for your cells. The good news is that picking a lithium charger comes down to two numbers: the charge voltage your pack needs, and how many amps you want for a reasonable charge time. This guide walks through both and compares chargers from our parts database using the specs their sellers list.
Step one: find your pack's full-charge voltage
A lithium charger works in two stages. It pushes constant current until the pack reaches a set voltage, then holds that voltage while the current tapers off. That set voltage (often called the CV or termination voltage) must match your pack. Work it out from the cell count:
- LiFePO4 drop-in kits (16S, 51.2V nominal): Epoch lists 58.4V as the maximum for its 48V kits. Most drop-in kits are sold with a matched charger, or name the charger profile to use, so follow the battery maker's instructions first.
- NMC EV modules: multiply the series cell count by the per-cell charge voltage you choose. 4.20V per cell is full; many builders stop at 4.10V to go easier on the cells. A 21S pack at 4.10V is 86.1V, and at 4.20V it is 88.2V. A 25S pack at 4.10V is 102.5V, and at 4.20V it is 105V.
Never set a charger above the pack maker's maximum, and make sure your BMS can stop charging (by opening a contactor or signalling the charger) if any single cell goes too high. The charger sees the whole pack, not individual cells.
Step two: estimate charge time from amps
A rough charge time is the pack's amp-hours divided by the charger's output amps, plus some extra for the slow final stage. For example, a 105Ah pack on a 10A charger needs roughly 10.5 hours from empty, while a 30A charger cuts that to about 3.5 hours. If you usually charge overnight from half full, a smaller charger is often fine. High-power chargers also draw more from the wall, so check your outlet and circuit, and note that some chargers cut their output on 110V AC.
Chargers we track
| Charger | Output (seller-listed) | Best fit |
|---|---|---|
| ECO-WORTHY 48V 60A Lithium Charger, adjustable V/A, CAN BMS (price TBD) | 32-64V, 0-60A adjustable (0-30A on 120V AC), CAN BMS support | 48V LiFePO4 packs |
| Charger 1800W 72V ($292) | 1800W, 72V class (output voltage and amps not listed in our record) | 72V-class packs, once you confirm its charge voltage |
| Chi Charger Mini Universal Charger 450W ($175) | 2-134.4V adjustable, 4-5A (450W) | 21S or 25S packs where slow charging is OK |
| Universal Smart Charger 0-103/105VDC 0-10A (CH-LI-Master100.8V) (price TBD) | 0-105V, 0-10A, adjustable CC/CV | 21S and 25S packs, on the bench |
| Chi Charger Pro Universal Smart Charger 4200W - 100-135V version ($375) | 100-135V, 1-30A (4200W; half rate on 110V AC) | 96V-class (25S) packs |
A few notes from checking these listings:
- 48V lithium: the ECO-WORTHY unit's 32-64V adjustable range covers a 58.4V LiFePO4 pack, and its CAN support lets a compatible BMS control charging. It was listed as currently unavailable with no price when we checked.
- 72V-class: the Hangar116 1800W charger is sold for 72V carts, but our record doesn't have its exact output voltage. Confirm it matches your pack (for example 86.1V or 88.2V for 21S) before you buy. The Chi Charger Mini can be set to 86.1V, which is why our Hill Climber build uses it, but at about 5A it is slow on a large pack. Chi also sells the Pro in a 66-93V version for 21S packs, which we don't track as a separate part yet.
- 96V-class: the Chi Charger Pro's 100-135V version covers a 25S pack at 102.5V or 105V and can push up to 30A. That's the charger in our Drag build.
- BatterySpace: its 0-105V range covers both 21S and 25S, but the seller describes a bench-style unit: 8 hours maximum continuous use, a warm-up period, a diode on the output for larger packs, and not waterproof or meant to ride on the cart. Price is by request.
Safety basics
- Fuse the charger lead and use a connector rated for the charger's current.
- Charge on a non-flammable surface with airflow, and don't leave a new setup unattended until you've watched a few full cycles.
- Check that your BMS cutoff, the charger's set voltage and your pack's maximum all agree.
- High-voltage builds should be done or inspected by a qualified professional.
Quick picks
- 48V lithium drop-in: the charger the battery maker specifies, or the ECO-WORTHY 48V 60A Lithium Charger, adjustable V/A, CAN BMS (price TBD) set to the maker's maximum.
- 72V-class EV modules (21S): Chi Charger Mini Universal Charger 450W ($175) if slow charging is fine, or confirm the Charger 1800W 72V ($292) output first.
- 96V-class (25S): Chi Charger Pro Universal Smart Charger 4200W - 100-135V version ($375).
The JuiceMyCart planner checks a charger's output range against your pack's maximum voltage and flags a mismatch before you buy.
Professional install: high-voltage and high-current golf cart builds, and suspension and brake work, should be done or inspected by a qualified professional. This guide is general information only.