Battery management · Ships from Poland
Smart BMS for DIY packs, campervans and off-grid power
Specifications published only after they are checked against the manufacturer's current documents. Delivery included to 25 countries.
FeaturedJK-BD6A20S6P60 A continuous$39.99delivery included- Delivery
- Included in price
- Warehouse
- Poland (POZ100)
- Wholesale
- 10+ units, mixed
Verified models, ready to quote
24 boards with specifications checked against the manufacturer's documents. Prices include delivery to 25 countries. Online checkout opens once the commercial gates clear — until then, request a quote and a technician confirms fit and availability.
JK-B1A20S15P
- Series
- Li-ion 7S–20S
- Continuous
- 150 A
- Port
- Common port
JK-B1A24S15P
- Series
- Li-ion 7S–24S
- Continuous
- 150 A
- Port
- Common port
JK-B1A8S10P
- Series
- Li-ion 3S–8S
- Continuous
- 100 A
- Port
- Common port
JK-B1A8S20P
- Series
- Li-ion 3S–8S
- Continuous
- 200 A
- Port
- Common port
JK-B2A20S20P
- Series
- Li-ion 7S–20S
- Continuous
- 200 A
- Port
- Common port
JK-B2A24S15P
- Series
- Li-ion 7S–24S
- Continuous
- 150 A
- Port
- Common port
JK-B2A24S20P
- Series
- Li-ion 7S–24S
- Continuous
- 200 A
- Port
- Common port
JK-B2A8S20P
- Series
- Li-ion 3S–8S
- Continuous
- 200 A
- Port
- Common port
What are you powering?
The same board behaves differently in a campervan and in a workshop. Each of these pages starts from the constraint that actually decides the model, not from a product list.
- RV / Campervan / Marine
In a vehicle or a boat, the load is intermittent and often inductive, the alternator is a second charging source, and the install is usually inside a confined space that nobody wants to open twice.
- Off-grid Solar / Backup
A stationary system trades mobility for scale: higher series counts, larger continuous currents, and a duty cycle that is close to continuous. The failure mode that matters is thermal, not mechanical.
- Electric Mobility
Traction loads are the harshest case for current ratings: high peak, fast repetition, and vibration that works loose any connection that was not mechanically secured.
- Battery Repair / PACK
A workshop needs different things from a retail buyer: documentation at the board revision level, repeatable configuration, and a way to test a repair without risking a customer's pack.
Browse by category
- Smart BMS
Bluetooth BMS with active balancing, 4S–32S
- Active Balancers
Standalone 1A–2A balancers for packs already in service
- Battery Equalizer
Series-connected pack equalizers
- Accessories
Displays, harnesses, parallel modules
Stock in Poland, not on a ship
Most listings for this product category still ship from China. Ours leaves a warehouse in Poland, with delivery already inside the price for 25 countries. That is the one advantage a new store can offer that a price cut cannot erase.
- Warehouse
- Poland (EU)
- Countries served
- 25
- Delivery cost
- Included in price
- Wholesale threshold
- 10 units, mixed
- Lead times
- Pending carrier contract
What this site will not do
- No invented specifications
- A wrong current rating or series limit damages equipment and creates a safety risk.
- No stock or delivery promises without warehouse data
- Unfulfillable shipping claims cause cancellations and chargebacks.
- No certification logos until scope and validity are checked
- A certificate that does not cover the product is a compliance problem, not a selling point.
- No reviews, ratings or sales counters
- They cannot be verified and are not part of the offer.
Technical reading, before the purchase
Written to be checkable: every claim that depends on a specific model is marked, and articles carry a technical review date once an engineer has signed off.
- Which BMS works with your inverter: the three-way match
A BMS and an inverter only talk when the protocol dialect, the physical layer and the pack window all line up. Here is the order to check them in.
- Active vs passive balancing: where the energy goes
Passive balancing turns excess into heat. Active balancing moves it to another cell. The difference matters more at low state of charge than at high.
- Chemistry decides the settings, not the board
The same BMS on LiFePO4 and on NMC needs completely different voltage thresholds. Using one profile on the other chemistry damages cells quietly.
Four questions we get first
- How do I know which BMS fits my pack?
- Two numbers decide it: the pack voltage (cells in series × 3.2 V for LiFePO4) and the continuous current your load draws. The sizing calculator works those out from your load, before any model is involved.
- Where does the stock ship from?
- A warehouse in Poland, covering 25 countries with delivery already included in the price. There is no separate shipping charge added at checkout.
- Why are there no prices or specifications on this page?
- Because they are not verified yet. Publishing a current rating that turns out to be wrong damages equipment, and a price quoted before the cost is verified is worse than no price. Both are being checked, and both will appear with a date.
- Can I buy ten or more units at a wholesale price?
- Yes — ten units in a mixed order, any combination of models. The price is set from a different cost tier, not from a discount on the retail price.
Tell us what you are building
Series count, load and destination country is enough for a real answer — including when the answer is that a model will not work.