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, standby, medical and security applications for cranking smaller gas and even diesel engines.
The most common YTX9-BS batteries are sealed lead-acid AGM and Gel-Cell batteries, but lithium YTX9-BS batteries are becoming more and more popular, too.
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 batteries 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|
|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|
|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|
|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|
|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|
|UpStart UB-YTX9-BS Battery||8||-||6.5 lbs; 2.95 kg|
|VMAX TANKS XCA20R9 Battery||9||120||7 lbs; 3.17 kg|
|Weize YTX9-BS Battery||8||135||6.11 lbs; 2.77 kg|
|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 and Gel-Cell batteries, with the lithium batteries being 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 CCA Amps ratings, and weighing around 6-8 pounds.
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 much 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.
Lithium YTX9-BS batteries feature nominal capacity around 5-8 Ah, with 150-300 CCA Amps ratings, and weighing 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 to 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.
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, 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.
What Kills YTX9-BS Batteries?
YTX9-BS and other Powersports batteries are designed to be robust and durable.
But, when used in motorcycles, ATVs, and similar vehicles, they are constantly exposed to vibrations, mechanical impacts, and often during summer, high temperatures.
In order to prolong the battery operating lifetime, be sure that the battery is positioned/strapped firmly and that it 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 which also 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 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...
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 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, this weight savings is 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 ...