Battery Equivalents and Replacements

YTX9-BS Battery Equivalents and Replacements

YTX9-BS batteries are compact and relatively lightweight sealed starting batteries commonly used in smaller motorcycles, power generators, boats, standbys, and medical and security applications for cranking smaller gas and diesel engines.

The most common YTX9-BS batteries are sealed lead-acid AGM and Gel-Cell batteries, but lithium YTX9-BS batteries are becoming increasingly popular.

Updated: January 13, 2024.

expert power etx9 bs

YTX9-BS Battery Features and Specifications

YTX9-BS batteries feature physical dimensions of 5.875 x 3.4375 x 4.125 inches (~150 x 87 x 105 mm), with the positive battery terminal positioned on the left side of the battery when the battery is observed from the front.

Note: some models feature battery terminals on both sides of the battery, helping with the battery positioning.

The most popular lead-acid and lithium YTX9-BS battery equivalents and replacements are given in the following comparison chart with their most important specifications:

Model 10h Capacity (Ah) CCA (Amps) Weight (lbs/kg)
Banshee DLFP9-BS Lithium Battery 8 150 (Lithium) 2.3 lbs; 1.04 kg
Battanux YTX9-BS Battery 8 135 5.95 lbs; 2.70 kg
Casil YTX9-BS Battery 8 144 6.2 lbs; 2.81 kg
Chrome YTX9-BS iGel Battery 6 180 6.61 lbs; 3.0 kg
Chrome YTX9-BS Pirate Bay Battery 8 120 6.61 lbs; 3.0 kg
DEESPAEK YTX9-BS Battery 6 350 (Lithium) 2.4 lbs; 1.09 kg
Deka Sports Power ETX-9 8 120 7 lbs; 3.17 kg
Energizer TX9 AGM Battery 8 120 6.75 lbs; 3.06 kg
EverLast CTX9-BS Battery 8 135 7 lbs; 3.17 kg
ExpertPower ETX9-BS Battery 9 180 6.04 lbs; 2.73 kg
Interstate YTX9-BS Battery 8 135 7.8 lbs; 3.53 kg
MaxLithium YTX9-BS Battery 6 360 (Lithium) 2.4 lbs; 1.09 kg
Mighty Max YTX9-BS Battery 8 135 6.72 lbs; 3.05 kg
MMG YTX9-BS Lithium Ion 5 300 (Lithium) 2 lbs; 0.91 kg
MotoBatt MBTX9U Battery 10.5 - 8 lbs; 3.62 kg
Neptune YTX9-BS Battery 9 120 6.6 lbs; 3.0 kg
NOCO NLP9 3 400 max. (Lithium) 2.29 lbs; 1.03 kg
NOCO NLP14 4 500 max. (Lithium) 2.58 lbs; 1.17 kg
PowerStar YTX9-BS Battery 8 - 9 lbs; 4.08 kg
Power-Sonic PTX9-BS Battery 8 120 7 lbs; 3.17 kg
SigmasTek STX9-BS Battery 8 120 6.19 lbs; 2.80 kg
TYKOOL YTX9-BS Battery 5 300 (Lithium) 2.3 lbs; 1.04 kg
Uplus YTX9-BS Battery 8 120 6.6 lbs; 3.0 kg
UpStart UB-YTX9-BS Battery 8 - 6.5 lbs; 2.95 kg
Weize YTX9-BS Battery 8 135 6.16 lbs; 2.79 kg
Weize YTX9-BS
Yuasa YUAM329BS YTX9-BS Battery 8 135 7.4 lbs; 3.35 kg

Note: Amazon links ("Model" column) open in the new windows, feel free to check them for the most up-to-date offers and prices.

As one can see, the most popular models of the YTX9-BS batteries are still non-spillable, maintenance-free AGM (Absorbent Glass Mat technology) and Gel-Cell batteries, with lithium batteries present on the market, but not in such numbers.

Lead-acid YTX9-BS batteries feature nominal capacity in the 6-10 Ah range, with 120-180 Cold Cranking Amps (CCA) ratings, and weigh around 6-8 pounds.

chrome ytx9 bs igel

Since YTX9-BS batteries are designed and intended as cranking/starting batteries, the actual capacity is of lesser importance than CCA/MCA/HCA ratings - for example, Chrome YTX9-BS iGel Battery (Amazon link, opens in the new window) features a nominal capacity of "only" 6Ah, but it provides 180 CCA, which is an excellent result for 6.61 lbs battery.

AGM and Gel-Cell starting YTX9-BS batteries are not intended for deep cycle applications, but if necessary, they can withstand many more cycles than older wet/flooded YTX9-BS batteries.

But, if You really must discharge any starting battery, not just the YTX9-BS battery, try not to discharge it below 50% DoD.

Note: When the starting battery is discharged below 50%, its ability to crank is decreased. Also, if you are looking for general purpose/deep-discharge battery of similar dimensions and capacities, feel free to check our 12V 9Ah (5.94 x 2.56 x 3.7 inches; 151 x 65 x 94 mm) and 12V 12Ah (5.94 x 3.86 x 3.98 inches; 151 x 98 x 101 mm) batteries articles.)

mmg ytx9 bs lithium

Lithium YTX9-BS batteries feature a nominal capacity of around 5-8 Ah, with 150-300 CCA Amps ratings, and weigh just 2-2.5 pounds.

By switching from lead-acid to lithium batteries, one may save 4-6 pounds, which is not that important for lawn tractors, power generators, and similar applications but can help motorbikes, ATVs, and other similar vehicles achieve better performances.

Also, some models of lithium YTX9-BS batteries are actually dual-purpose batteries, being able to provide strong currents and support 2000-3000 deep discharge cycles.

On the other hand, lithium batteries are very sensitive to charging conditions - if they are charged below 14V, they are not charged completely, and the charging voltages of 15 or more volts can damage or destroy the built-in Battery Management Systems (BMS).

Personally, if You are not a pro rider, a good AGM or Gel-Cell YTX9-BS battery is highly recommended. But, with technology improvements, lithium YTX9-BS batteries are becoming more and more popular, especially NOCO NLP9 and NOCO NLP14 models, which may fit battery compartments of other battery sizes, not just YTX9-BS.

How to Charge YTX9-BS Battery?

When the YTX9-BS battery is connected to the vehicle's electric system with an alternator and charge controller, let the vehicle charge the battery.

Note: Some of the modern YTX9-BS batteries come with a built-in battery voltage tester (especially lithium models), allowing the user to check the voltage and condition of the battery.

When the battery is out of the vehicle, the best thing to do is to charge lead-acid batteries with smart battery chargers that analyze the battery first and then adjust the charging according to the battery condition.

Considering the capacity of the lead-acid YTX9-BS batteries, battery chargers in the 0.750 - 1.0 Amps range are recommended.

Lithium batteries should not be charged using lead-acid battery chargers that feature desulfation and similar charging modes.

Lithium batteries should be charged using dedicated lithium battery chargers featuring Constant Current/Constant Voltage (CC/CV) charging modes. Or, one may use smart AGM battery chargers with the dedicated lithium battery charging mode.

The maximum charging current of the lithium YTX9-BS batteries varies among the models and should be checked for each model separately.

noco genius 1a h400px

One of the most popular advanced battery chargers is the NOCO GENIUS1 1A Smart Battery Charger (Amazon link opens in the new window), suitable for charging 6V and 12V lead-acid batteries (flooded, AGM, Gel-Cell) and 12V lithium batteries. It also acts as a battery maintainer and can be used to revive dead batteries (discharged down to 1(!) volt), etc.

To charge lead-acid batteries more accurately, it even comes with a thermal sensor. All in all, NOCO GENIUS1 is not the cheapest battery charger on the market in this class, but it is one of the most popular, if not THE most popular one.

What Kills YTX9-BS Batteries?

YTX9-BS and other Powersports batteries are designed to be robust and durable.

But, when used in motorcycles, ATVs, snowmobiles, and similar vehicles, they are constantly exposed to vibrations, mechanical impacts, and often high temperatures during summer.

In order to prolong the battery's operating lifetime, be sure that the battery is positioned/strapped firmly and cannot move, regardless of the vehicle's position or acceleration.

Also, it must be enclosed in a battery compartment that protects the battery from mechanical impacts (small rocks, pebbles, sand, etc.) and ensures good ventilation.

During the summer heat, when the vehicle is not in use, keep it in an air-conditioned area or at least in shade.

When the vehicle is not in use for a longer period of time, if possible, disconnect the battery to prevent parasite drain to discharge the battery and store it in an air-conditioned area connected to a smart battery charger/maintainer.

Since these batteries are generally not expensive, there is no need to go for the cheapest model...

weize ytx9 battery

Long Story Short: Although YTX9-BS batteries are much smaller and lighter than typical car starting batteries, they are not toys. They are designed to provide strong currents for a few very short seconds and are able to crank surprisingly large gas and diesel engines.

Lithium YTX9-BS batteries are emerging on the market, and they offer relatively large weight savings, but in reality, these weight savings are 4-6 pounds - enough for pro riders to consider them as their next YTX9-BS starting batteries.

But, for most applications, sealed lead-acid maintenance-free AGM and Gel-Cell YTX9-BS batteries are the way to go ...