A 6-volt battery at about four volts, or an 8-volt battery that low, is finished. The rest of the string has been abused by it.
The answer for one 6-volt or 8-volt battery far below the others
Replace the set. Do not put one new battery in that hole.
Write down all the voltages in one photo so we can see the spread. One number is not the set.
Charge, unplug, and rest a lead pack before you condemn it. A healthy 6-volt battery rests near 6.3 volts, an 8-volt near 8.4, a 12-volt deep-cycle near 12.6. A lithium pack is judged on its own meter, not on those numbers.
Hold that answer while you read the shop notes under it. The notes are the same rules we use on every cart. The answer above is the part that is specific to one 6-volt or 8-volt battery far below the others.
Grades show a weak pack
A cart that feels fine on a flat path and sags on a hill is telling you about voltage under load. Hills in the Texas Hill Country, north Georgia, Asheville, Hot Springs Village, and any lake community built on ridges pull more amps than a flat course. A resting voltage can look acceptable and still collapse when the motor asks for current.
The fix is not a higher voltage kit. A 72-volt pack in a 48-volt cart is the wrong pack. The fix is a healthy pack of the correct voltage, cables that are tight, and a size in amp-hours that matches the work. We do not publish a mile rating in this article. Terrain, seats, tires, and speed change the distance. The product page is where a manufacturer prints a range estimate when they have one.
Amp-hours are not volts
Voltage has to match the cart. Amp-hours are how much work the pack can do at that voltage. A 48-volt 65Ah battery and a 48-volt 105Ah battery are the same voltage and different amounts of stored energy. The two Bedrock 48-volt 105Ah shapes, compact and slim, hold the same 5.38 kWh and fit different trays. A 150Ah 48-volt pack is more energy again. A 72-volt pack is a different voltage, not a ‘bigger 48.’
We will not invent a mile number for a 105Ah pack. Seats, hills, tire size, speed, and a stereo all change distance. Use the manufacturer’s range note on the product page when they publish one, and use your real day of driving as the test. A cart that only does nine holes does not need the same pack as a cart that is a daily driver on a path system.
A lift kit does not change voltage
Bigger tires and a lift pull more amps. They make a marginal pack feel worse on hills and at speed. They do not turn a 48-volt cart into a 72-volt cart, and they do not turn a 36-volt cart into a 48-volt cart. If you want more torque, you are in controller and voltage territory that has to be designed, not guessed in a battery article.
Buy the pack voltage the cart has now, in an amp-hour size that can feed the extra work, and keep the cables tight. Tell us about the lift and the tire size when you ask for a fit, because it explains a complaint. It does not change the bracket.
Series and parallel are different words
The batteries already in a 36-volt or 48-volt lead cart are in series. Voltage adds. Amp-hours do not. Allied Drop-in-Ready 48-volt modules are the exception we sell on purpose: they are designed to be paralleled, voltage stays 48, and capacity adds, and they require Allied’s 500-amp disconnect. Do not parallel random 48-volt lithium batteries from two brands because a forum said capacity adds.
Do not series two 48-volt lithium packs to ‘make 96 volts’ for a cart. That is a different vehicle than the one you have, and it is a good way to destroy a controller. Stay with the voltage the cart was built for unless a named kit and a controller plan say otherwise.
Lights, stereos, and other 12-volt loads
Headlights, a stereo, a fan, a USB port, and a windshield wiper are 12-volt loads. On a lead pack they were often taken from two batteries in the string, which is hard on those two batteries. On a lithium pack they come from the converter. A converter that is missing or undersized shows up as dim lights or a cart that runs with no accessories.
Those loads also spend amp-hours. A cart used at night for neighborhood errands is a different energy job than nine holes at noon. We still will not invent a mile claim. We will say: size the pack for the day you actually drive, and put the converter on the order if the kit does not list one.
AGM and flooded are both lead-acid
AGM costs more up front and does not get watered. Flooded costs less and lasts when someone actually waters it. Both are lead-acid. Both want a full charge after you drive. Both take a lead-acid charger, not a lithium charger. Both carry the $18 core on every battery.
An AGM battery that you decide to ‘maintain’ with a watering jug is ruined. A flooded battery that never gets water is also ruined. Pick the one the household will actually live with. Neither choice is a lithium conversion, and neither one removes the need to match voltage and terminal style.
Allied packages and Drop-in-Ready modules
Allied commercial packages are a conversion in one box: battery, waterproof lithium charger, charging harness, 4-gauge cables, hardware, and brackets on most batteries. The RS line adds Allied’s remote power button. Allied Lithium packages ship free from Allied.
Drop-in-Ready batteries are single 48-volt modules you can parallel, so you can start with one and add range later. Allied requires its 500-amp disconnect on those installs and includes the switch with orders of two or more DIR batteries. Installing DIR batteries without that disconnect voids the warranty. Five or eight years, depending on the line, is the warranty language on the listings we have seen. The product page is the current term.
Warranties are not all 10 years
Read the warranty that belongs to the brand in the cart. Bedrock kits are 10 years transferable. BOLT is 12 years transferable. ECO listings we carry state a limited lifetime warranty. Allied listings we have seen state 5 or 8 years depending on the line. EPOCH golf listings we carry state 11 years. Dakota deep-cycle listings are mostly 11 years, with shorter terms on chargers. Vatrer listings we carry state 10 years. Lithium Rhino kits are 8 years. BigBattery lists 12 years on the Husky 2. Trojan Lithium lists 10 years. Interstate’s LIGC48V100 is 60 months of a 10-year limited warranty. Antigravity starting batteries we carry state 3 years.
A longer warranty is not a fitment. The bracket still has to match the tray. Register the warranty the way that brand asks. We will not stretch one brand’s term onto another brand in an email.
Parts and pages that match this
- Fitment guide
- Shop
- Lead-acid vs lithium
- Shipping
- Returns
- Warranty
- Contact
- Chargers
- Parts
- 48V/72V converter
- Parts
- Chargers
- Bedrock
- Send the readings
The price for one 6-volt or 8-volt battery far below the others is the price on the product page, not a number in this article. Bedrock conversion kits ship free. Allied Lithium packages ship free from Allied. That is not a promise that every brand ships free. We ship one 6-volt or 8-volt battery far below the others. We do not list a storefront address. Local delivery is only the area named on the shipping page. A city page on this site is not a statement that a driver covers that city.
