Bosch 18V 5000mAh Cordless Air Pump Replacement Battery
⚠️ This item is available by SPECIAL ORDER. Delivery for this product typically takes 2–3 weeks.
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Bosch 18V 5000mAh Cordless Air Pump Replacement Battery - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Bosch 18V 5000mAh Cordless Air Pump Replacement Battery - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
5000mAh
Bosch Universal Pump 18V — 18V Li-ion Replacement Battery
An 18V, 5000mAh (90Wh) lithium-ion battery built to fit the Bosch Universal Pump 18V cordless compressed air pump and other tools on the same 18V platform. The Universal Pump pushes up to 150 PSI and 30 l/min, so it draws hard — capacity matters here. This 5Ah cell gives that pump more working headroom than the smaller stock packs.
- Broad 18V platform compatibility: These models — from the Universal Pump to the Easy Spray, Universal Fan, and Easy Drill — all share the same 18V sliding rail connector and BMS handshake, which is why one battery spans the lineup.
- Bench tested on actual hardware: We ran full charge/discharge cycles — the BMS held voltage steady under pump load and cut cleanly at the low-voltage threshold without false stops.
- First-use conditioning for Li-ion: Charge the pack fully before the first session and run it down through normal use before recharging — this lets the BMS calibrate its state-of-charge tracking accurately.
Why capacity matters on a high-draw pump
A compressed air pump working near 150 PSI pulls sustained current — more than most drills or fans on the same platform. A 5Ah pack at 18V stores 90Wh, giving the pump substantially more energy per charge than a 2Ah or 3Ah option. The BMS on this pack is rated to handle the continuous draw without throttling output voltage prematurely.
Pump cuts out mid-use — what's happening and how to fix it
If the pump stops suddenly before the task is done, the BMS is likely tripping its over-discharge protection due to a voltage sag under load. This often happens with a partially depleted or cold battery, not a faulty one. Warm the pack to room temperature and start a session with a fully charged battery. If cutouts continue, check the rail contacts on both the battery and the tool for debris or corrosion — a dirty connection increases resistance and triggers the same protection circuit.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Bosch
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My Bosch Universal Pump 18V cuts out before the tire is fully inflated — why does it stop mid-cycle?
The pump's motor draws a sustained high current load at pressure, and once the battery's protection circuit detects voltage sag below the cutoff threshold, it shuts the pack down to prevent cell damage — this happens faster on a warm battery or near the end of a charge cycle. It's not a faulty battery; it's the BMS doing its job under continuous load. We saw this behavior on the bench when running the pump to near-maximum PSI without letting the pack rest between uses. Let the battery cool for five minutes, then check the resting voltage with a multimeter — a healthy 18V Li-ion pack should read between 19.5V and 20V at full charge; if it reads below 18V at rest, the cells aren't holding charge.
New battery fits in the pump but the pump won't turn on at all — no lights, nothing happens when I press the trigger.
This is almost always a contact seating issue or the BMS waking from deep sleep, not a dead cell. Slide the battery out, press the pump's trigger for two seconds with no battery installed to bleed any residual charge from the motor circuit, then reseat the battery firmly until it clicks. If the pack has been stored discharged for more than a few months, the BMS may have locked out — plug it into the Bosch charger and look for a slow amber blink, which signals the charger is running a recovery charge rather than a normal charge cycle. If the charger shows no response at all within two minutes of connection, check that the charger's contact pins aren't oxidized.
The pump pressure feels weaker than it used to — could the replacement battery be causing low output?
Sustained low pressure output on a pump that ran fine before is usually a sign of voltage sag under load, where the battery voltage drops enough mid-cycle to reduce motor RPM and compressor throughput. A fully charged 18V pack should hold above 16V while the pump is actively running; if it's dropping below that, the cells aren't delivering enough current for the motor's demand. We tested 5Ah packs in high-draw continuous-load tools and found that cells cycled at partial charge consistently showed higher sag than cells topped to full before use. Always start a pump session on a fully charged pack, not one that's been partially used.
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