The Bolt Energy 48V 105Ah Square is a complete lithium iron phosphate (LiFePO4) conversion kit for the Yamaha G29/Drive (2007–2016) and Yamaha Drive2 (2017+). One battery replaces all of your lead-acid batteries, includes everything needed to complete the swap, and is backed by a 12-year manufacturer warranty.

Here is what actually changes the day after you install it:

• Your cart loses roughly 100 lbs of dead weight you feel it immediately in acceleration and handling
  
• Hills you used to crawl up, you climb without slowing down
  
• The cart runs at full power on mile 40 the same as mile 1 no fade, no slowdown as the charge drops
  
• You pull into the garage, plug in one cable, and walk away no watering, no terminal cleaning, no equalization charges
  
• You stop budgeting for a new battery set every 3–5 years
  
• Your phone shows you exactly how much charge is left no more guessing from a voltage gauge that barely moves

That is the real outcome of switching to lithium. Everything below explains how it works and whether it is right for your cart.

Who is this battery best for?

• Yamaha G29/Drive or Drive2 owners whose lead-acid batteries are aging, failing, or due for replacement
• Owners who want more range, better hill performance, or a lighter cart
• Anyone tired of watering batteries, cleaning terminals, or managing a charging routine
• Owners in cold climates who want a battery that handles freezing storage (heated option)
• Anyone planning to keep their cart for 5+ more years and wants one battery purchase that lasts

Two kit tiers. One heated upgrade option. The Standard Kit covers the battery, charger, SOC meter, and hardware. The Professional Kit adds a 400A solenoid, 2-gauge cables, and a 30A DC-to-DC reducer for 12V accessories recommended for most Yamaha conversions. The heated version adds a self-warming system for cold-climate charging, available on either kit tier.

Why Switch to Lithium?

Lead-acid batteries were the only option for decades. They still work but they come with a maintenance and replacement cycle that adds up. Here is an honest comparison:

The honest math on cost: A quality set of 6×8V lead-acid batteries for a Yamaha G29 or Drive2 runs $600–$900 and lasts 3–5 years before performance drops enough to warrant replacement. Over 12 years the length of Bolt's warranty you would replace lead-acid batteries 2–4 times. One lithium kit, installed once, covers the same period with better performance throughout.

Key Benefits

• About 100 lbs Lighter Than Lead-Acid
  Six 8V or four 12V lead-acid batteries combined weigh well over 200 lbs. The Square weighs 100.8 lbs. That weight comes out of the rear of the cart immediately acceleration improves, the cart handles better on turns, and frame stress is reduced. On hilly terrain the difference is noticeable from the first ride.
• Flat Voltage = Consistent Power Start to Finish
  Lead-acid voltage drops steadily as the pack drains your cart slows down and loses torque as the charge falls. LiFePO4 voltage stays nearly flat from roughly 90% charge down to about 20%. Your cart runs at the same power level throughout the ride, not just when the batteries are fresh.
• 30–50 Miles Per Charge
  Range depends on load, terrain, speed, and tire pressure. Most G29/Drive and Drive2 owners coming from aging lead-acid see a significant jump in usable range. Bolt Energy offers a Distance Calculator at boltenergyusa.com for an estimate based on your setup.
• Zero Maintenance for the Life of the Battery
  No water to check. No terminals to clean. No equalization cycles to run. No acid to manage. The battery is completely sealed and requires nothing from you between charges. Plug in, ride, repeat.
• 12-Year Warranty 6 Years Full Replacement
  Bolt Energy backs the Square with one of the longest warranties in the golf cart battery category. Years 1–6: full replacement at no cost. Years 7–12: prorated. Register at boltenergyusa.com within 30 days of purchase. For full details read our Warranty Tab
• Bluetooth Monitoring + OTA Updates
  The free Bolt app (iOS and Android) connects to the built-in Bluetooth receiver and shows state of charge, cell voltages, temperature, and fault codes in real time. BMS firmware updates over the air no hardware changes needed.
• IP66 Powder Coated Steel Enclosure
  Built to IP66 standard handles rain, wash-down, and outdoor exposure without damage to the housing or internal components.
• Grade-A Prismatic LiFePO4 Cells
  Thermally stable chemistry that does not vent gas, does not produce acid, and does not require the safety precautions that older lithium chemistries did. Safe to store in a closed garage.

What's in the Kit

Both kit tiers include the same Thin battery. The Professional Kit adds the components most Yamaha conversions require.

Which kit is right for your Yamaha?
For most G29/Drive and Drive2 conversions, choose the Professional Kit. The solenoid needs replacing on any lithium conversion. The 2-gauge cables handle lithium's discharge levels better than factory wiring. The 30A DC-to-DC reducer is required if your cart has lights, a horn, USB ports, or any other 12V accessories. The Standard Kit works only if your solenoid is recently replaced and your cart has zero 12V accessories.

Compatibility

The Square is the correct form factor for Yamaha carts with a grouped battery tray. This page covers:

Square vs. Thin | what's the difference?
Same battery, different shape. The Square (12.8″ × 12.01″ × 10.42″) fits the grouped tray in the G29/Drive and Drive2. The Thin (20″ × 8.43″ × 10.65″) fits the long narrow tray in the G19 and G22. Same specs, same power, same price. If you have a G29, Drive, or Drive2 you want the Square. Not sure which tray your cart has? Contact us before ordering.

Have a Yamaha G19 or G22? Those models use the Thin battery  different tray shape, same specs. See the Yamaha G19/G22 page →

Important: Yamaha G1 through G16 models are 36V carts and require the 38.4V Classic battery not this product. This kit is for 48V systems only (G29/Drive 2007–2016, Drive2 2017+). If you are unsure of your cart's voltage, check the spec label on the cart or contact us before ordering.

Controller compatibility: Stock GE SepEx controllers (G29/Drive) and stock Toyota Industries PowerTech AC controllers (Drive2) are compatible with the Square out of the box no reprogramming needed. If your cart has an aftermarket controller, confirm lithium voltage compatibility with that controller's manufacturer before installing.

Note on the Drive2 PowerTech Li: If your Drive2 came with lithium from the factory, this kit is not for you your cart already has an OEM lithium system.

Installation

Most stock G29/Drive and Drive2 conversions take 1–3 hours with basic hand tools. No welding, cutting, or controller reprogramming required for stock carts.

What the install involves:

• Remove the existing lead-acid batteries (the lead removal strap in the Pro Kit helps with this)
• Mount the Square using the included bracket it fits in the original grouped battery tray space
• Connect the main cables and terminal connectors
• Install the SOC meter and Bluetooth receiver
• Handle the OBC charger interlock bypass if your G29 has one (a simple wiring step covered in the installation instructions)
• Replace the solenoid (Pro Kit includes a 400A unit)
• Install the DC-to-DC reducer if your cart has 12V accessories (included in Pro Kit)
• Cycle the Tow/Run switch flip to Tow, wait 30 seconds, flip back to Run before first test drive

If you are not comfortable with the wiring steps, a local golf cart dealer or technician can complete the installation. We are also available by phone or chat if you have questions during the process.

Performance

Here is what G29/Drive and Drive2 owners typically notice after switching to the Bolt Energy Square:

• Faster off the line. Removing 100+ lbs of battery weight reduces the total load the motor has to move. Most owners feel the difference immediately on the first test drive.
• Stronger hill climbing. LiFePO4 delivers consistent amperage under load. Lead-acid voltage sags when the motor pulls hard on steep grades this shows up as slowdown. Lithium does not sag the same way.
• No slowdown as the charge drops. Lead-acid performance degrades noticeably in the bottom third of the charge. LiFePO4 voltage stays flat, so the cart feels the same at 30% charge as it did at 90%.
• More usable range. The 105Ah capacity combined with the flat discharge curve means more of the rated energy is actually usable in normal driving you are not cutting rides short because the cart is dragging.
• Drive2 regen braking still works. The Drive2 PowerTech AC controller's regenerative braking is fully compatible with LiFePO4. You do not lose this feature after converting.

Will it make my cart faster? Lithium does not change your controller's top speed limit. What it changes is how the cart gets to that speed and how consistently it maintains it especially under load and on hills. If you want higher top speed, that requires a controller or motor upgrade, which is separate from the battery.

Cold Weather

Standard LiFePO4 batteries including the standard Square cannot charge below 34°F (1°C). The BMS blocks charging until the cells are warm enough. You can still drive (discharge) the cart in cold weather only charging is restricted.

If your G29/Drive or Drive2 is stored or charged in an unheated garage, barn, or outdoors in freezing temperatures, the heated version is the right choice. Here is exactly how it works:

• You plug in the charger as normal
• If the battery is below the charging temperature threshold, the internal heater activates automatically and warms the cells from the inside
• Once the battery reaches approximately 34°F, the heater shuts off on its own and normal charging begins no switches, no manual steps
• The heater only runs while the charger is plugged in it draws no power while you are driving or when the cart is unplugged
• Plug in before bed in a cold garage the battery warms itself, charges fully, and is ready to go in the morning

Both the standard and heated versions have identical charge and discharge specifications. The only difference is the self-heating capability. If you are in a mild climate or keep your cart in a heated space, the standard version is fine.

Bluetooth & Monitoring

Every Square includes a built-in Bluetooth receiver and a Smart SOC meter. Here is what you get:

• Bolt Mobile App (iOS + Android free): Real-time state of charge, individual cell voltages, pack temperature, and fault codes. Connect from your phone in seconds.
• Over-the-Air BMS Updates: Bolt can push firmware improvements directly to your battery through the app. No hardware changes, no shipping the battery anywhere.
• Remote Diagnostics: Bolt technicians can read the app data remotely to diagnose most issues without a shop visit.
• CAN Port: A secondary communication port for dealer and technician-level diagnostics and testing.
• Smart SOC Meter: Replaces your stock dash gauge, which reads lead-acid voltage curves and is meaningless on lithium. The SOC meter is calibrated for LiFePO4 and shows actual remaining charge.

The stock Yamaha dash voltage gauge stays nearly flat across most of LiFePO4's discharge curve it is not useful for tracking charge. The included SOC meter is what you will actually rely on day-to-day.

FAQ

Specifications