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KTM’s parts catalogue identifies battery 90611053000 as a 12V/8Ah unit for both the 2018 RC 390 and the redesigned 2022–23 RC 390; the 2022 owner’s manual calls the fitted battery ETZ-9-BS. The fitment evidence therefore points to the YTX9-BS-size family (about 150 × 87 × 105–106 mm), with terminals viewed from the front as positive left and negative right. Do not substitute the taller YTZ10S/YTZ-family sizes merely because a retailer calls them an upgrade.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | KTM OEM 90611053000 12V/8Ah Battery | $170.24 | Amazon |
| 2 | Yuasa YTX9-BS AGM Battery | $98.91 | Amazon |
| 3 | Yuasa YTX9 Factory Activated AGM Battery | $130.46 | Amazon |
| 4 | Fire Power CTX9-BS(FA) Activated AGM | $57.95 | Amazon |
| 5 | Duraboost DAX9-BS Activated AGM | $79.99 | Amazon |
| 6 | Fire Power HJTX9-FP-IL Featherweight Lithium | $165.95 | Amazon |
| 7 | Antigravity ATZ-10-HD Re-Start Lithium | $251.99 | Amazon |
| 8 | Shorai LFM14A4-BS12 Lithium Iron | $175.95 | Amazon |
| 9 | Scorpion sYTX9-BS Sealed AGM | $51.95 | Amazon |
The picks, in detail
KTM OEM 90611053000 12V/8Ah Battery
Tier 1—OEM fitment. KTM lists this 12V/8Ah battery for RC 390 model years 2018, 2022 and 2023. Its OE code is the safest reference when ordering through a KTM dealer; terminal orientation must match the original battery.
- KTM 90611053000
- 12V 8Ah
- RC 390 2018 and 2022–23 catalogue fitment
- Exact KTM part number
- Both generation tiers documented
- CCA and dimensions not published in KTM catalogue
Yuasa YTX9-BS AGM Battery
Tier 1—verified RC390 2015–2024 fitment. AGM YTX9-BS with 8.4Ah, 135 CCA and 150 × 87 × 105 mm dimensions. It uses the YTX9-BS polarity/layout; confirm the positive-left, negative-right terminal orientation against the bike before installation.
- AGM; 8.4Ah; 135 CCA
- 150 × 87 × 105 mm
- YTX9-BS terminal layout
- Direct 2022 RC390 exact-fit listing
- Also listed through 2024
- Acid-pack activation version
Yuasa YTX9 Factory Activated AGM Battery
Tier 2—new-generation exact-fit retailer listing for 2022 RC390. Factory-activated 12V AGM YTX9-size battery; the same 150 × 87 × 105 mm, 8.4Ah/135 CCA YTX9-BS case standard applies, with positive left viewed from the terminal side.
- factory-activated AGM
- 8.4Ah; 135 CCA
- 150 × 87 × 105 mm YTX9-BS
- No acid filling
- Exact 2022 RC390 listing
- Costs more than acid-pack Yuasa
Fire Power CTX9-BS(FA) Activated AGM
Tier 2—verified 2022 RC390 exact-fit listing. Factory-activated AGM with 8Ah and 130 CCA in the YTX9-BS 151 × 87 × 106 mm class; retain the bike’s positive-left/negative-right cable orientation.
- AGM; 8Ah; 130 CCA
- 151 × 87 × 106 mm
- YTX9-BS terminal layout
- Ready to install
- Exact 2022 listing
- CCA is below Yuasa’s 135 figure
Duraboost DAX9-BS Activated AGM
Tier 2—verified 2022 RC390 exact-fit listing. AGM DAX9-BS is 8Ah and 135 CCA, 5.9 × 3.4 × 4.1 inches (about 150 × 86 × 104 mm), with +/− terminal configuration.
- AGM; 8Ah; 135 CCA
- 150 × 86 × 104 mm
- +/− terminals
- Activated AGM
- Exact 2022 listing
- Slightly shorter published height than OE-size examples
Fire Power HJTX9-FP-IL Featherweight Lithium
Tier 1 and Tier 2—Cycle Gear lists RC390 2015–2024 fitment. Lithium-ion-polymer model with 165 CCA, 6 × 3 7/16 × 4 3/16 inch dimensions (152 × 87 × 106 mm) and conventional posts; use a lithium-compatible charging approach.
- lithium-ion polymer; 165 CCA
- 152 × 87 × 106 mm
- RC390 2015–2024 fitment
- Direct RC390 multi-year fitment
- Built-in LED test gauge
- Lithium-specific charger considerations
Antigravity ATZ-10-HD Re-Start Lithium
Tier 2—exact-fit retailer listing for 2022 RC390. This LiFePO4 replacement explicitly cross-references YTX9/YTX9-BS: 525 CA, 9Ah actual/115Wh, 150 × 88 × 92 mm. Its shorter height is a manufacturer-designed case difference, not a taller YTZ substitution.
- LiFePO4; 525 CA; 9Ah actual
- 150 × 88 × 92 mm
- YTX9-BS cross-reference
- Re-Start reserve feature
- Exact 2022 listing
- Much higher price
- Use specified lithium charger
Shorai LFM14A4-BS12 Lithium Iron
Tier 1—listed for the 2018 RC 390. LiFePO4 pack with 4.5Ah actual capacity, 210 CCA and 148 × 86 × 88 mm case. Its A polarity is +/−; verify the shorter case’s supplied spacers and cable reach against the RC 390 tray.
- LiFePO4; 4.5Ah actual; 210 CCA
- 148 × 86 × 88 mm
- A polarity (+/−)
- Documented 2018 RC390 listing
- Very low weight
- Not an AGM charger profile
- Shorter than OE-size AGM
Scorpion sYTX9-BS Sealed AGM
Tier 2—2022 RC390 YTX9-BS replacement class. Sealed AGM, 8Ah and 135 CCA, measuring 5 7/8 × 3 3/8 × 4 1/8 inches (about 149 × 86 × 105 mm), with +/− polarity and a stated YTX9-BS OEM reference.
- sealed AGM; 8Ah; 135 CCA
- 149 × 86 × 105 mm
- +/−; YTX9-BS reference
- Ready charged
- Published full dimensions
- Confirm RC390 year with retailer selector
Buying tips
- Tier 1 is the 2014–21/first-generation family; Tier 2 is the redesigned 2022–24 RC 390. KTM’s 90611053000 appears in both catalogue families, but check the VIN-specific parts fiche before purchasing.
- Measure the removed battery and photograph the cable orientation. The compatible YTX9-BS layout is positive left and negative right when viewed from the front/terminal side.
- Do not infer fitment from a Duke listing. This list uses RC 390 fitment evidence; a YTZ8V, YTZ10S or taller 150 × 70 × 130 mm battery is not automatically an RC 390 substitute.
- Use an AGM charger for AGM batteries. Lithium batteries need the battery maker’s approved charging method; never use a desulfation mode unless the maker permits it.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.