JKBMS JK-B2A8S Active Balancer — 2A 2~8S Battery Equalizer — current JKBMS product facts
Canonical product page: https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer
Retrieved at: 2026-11-05T06:02:47.279Z
Category: JKBMS Active Balancers

JKBMS JK-B2A8S is a standalone 2A active battery equalizer. The current batch supports 2–8S, confirmed by the merchant on 2026-10-15. Keep a suitable protection BMS and confirm chemistry, interfaces and the matched wiring before ordering.

Current configurations and sources

Configuration: JK-B2A8S
Internal store SKU: JKBMS-SKU-000047
Listed price: USD 59.68 per item, before destination shipping and separately selected extras.
Selection URL: https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer?configuration=jk-b2a8s
Technical evidence: factory-confirmation-required
Configuration data: {"sku":"JKBMS-SKU-000047","legacyAliases":["jkbms-jk-b2a8s-active-balancer-jk-b2a8s","JK-B2A8S-jk-b2a8s","jkbms-jk-b2a8s-active-balancer::jk-b2a8s","jk-b2a8s-jk-b2a8s"],"productSlug":"jkbms-jk-b2a8s-active-balancer","name":"JKBMS JK-B2A8S Active Balancer — 2A 2~8S Battery Equalizer","configuration":"JK-B2A8S","url":"https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer?configuration=jk-b2a8s","productFamilyUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer","currency":"USD","priceCents":5968,"maximumQuantity":999,"inventory":{"status":"not-verified","poolId":"JKBMS-SKU-000047","scope":"sku","source":"No current verified inventory snapshot is available.","sourceKind":null,"physicalQuantity":null,"availableQuantity":null,"lastInventoryVerifiedAt":null,"validUntil":null,"checkoutListed":true,"realtime":false,"reservationStatus":"not-reserved","availability":"unknown"},"image":{"url":"https://www.jkbms.net/images/jkbms-ice-blue-v2/asset-333-60db235680.webp","scope":"product-family","exactSkuAppearanceVerified":false},"description":"Technical data for JK-B2A8S requires exact-model documentation. Confirm chemistry, strings, current duty, interfaces, hardware revision and harness before ordering.","included":["The selected JKBMS active balancer model","Sampling harness, connector leads, and standard accessories shown in the selected product packing list","Basic supplier packing and available model documentation"],"notIncluded":["Battery protection BMS, charge/discharge switching, contactors, precharge circuit, battery cells, and system power hardware","Optional communication hardware, controller, cable, or cascade accessory unless listed in the selected product packing list","Onsite installation, commissioning, battery repair, or system integration"],"packageContentsScope":"Product family; selected configuration determines which listed components apply.","technical":{"status":"factory-confirmation-required","selectedModel":"JK-B2A8S","batteryCompatibility":null,"current":null,"balanceCurrentA":null,"communication":null,"revisionNotes":[],"manuals":[],"note":"Confirm exact model, revision, chemistry, strings, current duty and interfaces before ordering."},"purchaseFacts":{"kind":"active-balancer","productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer?configuration=jk-b2a8s","guideUrl":"https://www.jkbms.net/guides/standalone-active-balancer-vs-bms","model":"JK-B2A8S","balanceCurrentA":2,"balanceCurrentScope":"Nominal active-balancing current class, not battery charge or discharge current and not a continuous maximum-current guarantee.","currentBatchSeriesRange":"2–8S","seriesRangeEvidence":{"kind":"merchant-confirmed-current-batch","confirmedAt":"2026-10-15","sourceUrl":"https://www.jkbms.net/guides/standalone-active-balancer-vs-bms"},"evidenceScope":"Merchant product guidance based on the company catalogue; separate from exact-manual technical verification. Confirm chemistry, hardware revision and matched wiring before ordering.","interfaceNote":"Confirm the interfaces on the supplied hardware; CAN, RS485 and cascade are not assumed.","replacesProtectionBms":false},"selectionGuidance":{"productPageUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer?configuration=jk-b2a8s","factsTextUrl":"https://www.jkbms.net/products/jkbms-jk-b2a8s-active-balancer/facts.txt","factsJsonUrl":"https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s-active-balancer","guideUrls":["https://www.jkbms.net/guides/standalone-active-balancer-vs-bms"],"note":"Match the full model code, selected package and supplied hardware revision. Merchant guidance does not upgrade unverified technical facts to manual-verified status. Read the current product page and matched manual before purchase."},"featureRequests":null,"shipping":{"currency":"USD","region":"global","rate":{"standardCents":0},"quoteUrl":"https://www.jkbms.net/commerce/quote.json","transitTime":null,"verifiedDestinationEstimates":[],"note":"Only unexpired destination estimates for this SKU or shared product family are shown. Each estimate states its day basis and starting stage, and is not guaranteed. Import charges and carrier restrictions are not calculated."}}

Questions answered on the product page

Does JK-B2A8S replace my protection BMS?
No. It is a standalone active equalizer that transfers energy between cells. A suitable BMS and system protection are still required for overcharge, overdischarge, overcurrent, temperature and short circuits.

What does 2A balancing current mean?
It is the nominal balancing-current class of JK-B2A8S, not the permitted charge or discharge current of the battery pack. Actual current and correction time depend on voltage difference, settings, wiring, temperature and cell condition. It is not a promise of continuous operation at the maximum balancing current.

How do I check whether JK-B2A8S fits my pack?
The merchant confirmed 2–8S support for the currently sold batch on 2026-10-15. Provide the chemistry, exact series count, cell capacity, voltage spread and existing BMS model, and verify the matched wiring and settings. Nominal pack voltage or a historical specification alone does not establish compatibility.

Are CAN, RS485 and cascade operation included?
Do not assume they are included. Confirm the supplied hardware revision, physically available interfaces, protocol, pinout and quoted accessories. A matching connector does not establish compatibility, and support on a related model does not prove support on this one.

Can active balancing repair a weak cell?
Balancing cannot repair a damaged cell, a loose connection, a major capacity mismatch or incorrect charger settings. Diagnose the cause of repeated imbalance first; selecting a higher balancing current does not replace that check.

Which wiring diagram should I use?
Use only the manual and wiring diagram matched to the complete model code, hardware revision and supplied harness. Before connection, have a qualified installer verify the sampling-wire sequence and the voltages specified in that manual. Do not copy the wiring diagram of a similar-looking model.

Before purchase
- Prices and availability are retrieved from the current published store data. Recheck the selected package and destination before payment. Inventory snapshots are not stock reservations.
- Technical evidence is configuration-specific. A merchant-confirmed current-batch fact is not an exact-model manual, and a nearby model does not establish compatibility.
- Product-family photographs do not verify exact SKU appearance. Internal store SKUs are not GTIN or EAN barcodes.
- Purchases complete on the JKBMS website. This document does not establish any AI-platform approval, formal feed distribution or native payment integration.

Current JSON: https://www.jkbms.net/commerce/catalog.json?product=jkbms-jk-b2a8s-active-balancer
Purchase policies: https://www.jkbms.net/policies
Model and revision confirmation: https://www.jkbms.net/contact