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NaceCare NX1K lithium iron phosphate battery 911948, gray case with red Numatic label and carry handle

NaceCare NX1K LFP Lithium Iron Phosphate Battery (911948) for NX1K Floor Scrubbers

by NaceCare
$1,500.00 + free shipping

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Authorized Retailer NaceCare
Ships within 2–4 Business Days
Estimated Delivery 7–10 Business Days
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No Sales Tax Tax-free in all states except Wyoming
Manufacturer Warranty IncludedNaceCare 5-year NX1K battery warranty · Coverage backed directly by NaceCare
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(855) 601-5678  ·  support@oneupcleaning.com

What's included:

  • 1 NX1K LFP battery assembly (911948), 25.6 V 50 Ah
  • Charges in the machine with its on-board charger (no charger in the box)

The NaceCare NX1K Lithium Iron Phosphate Battery: One Battery for Every NX1K Floor Scrubber


The NX1K (part 911948) is the battery inside NaceCare's NX1K floor scrubbers, from the 20-inch TBL 1120 walk-behind to the TVL 850 ride-on. It's a sealed 25.6 V, 50 Ah lithium iron phosphate (LFP) pack holding 1,280 Wh, and it weighs about 22 lbs.

NaceCare rates it for more than 4,000 charge cycles, which it puts at roughly 15 years of cleaning five days a week. There's no watering, no acid and no equalizing, and you can charge it whenever there's a break, whether it's nearly empty or half full. That's what makes a lunch-break top-up on a long route practical.

Most owners buy one for two reasons: to replace a battery on a machine they already run, or to add runtime. On the TBL 1120, the two-battery TBL 1120/100 costs $1,500 more than the one-battery /50, which is the price of this battery, and doubles the runtime from 2 hours to 4.


Which Floor Scrubbers Use the NX1K Battery?

Every machine below runs on the same 911948 battery; the number in brackets is how many it holds. Click a model to see its page.

Not sure which battery your machine takes? Send us the model or serial number, or call (855) 601-5678, and we'll confirm before you order.


NX1K vs Lead Acid and the NX300: How the Floor Scrubber Batteries Compare

These are NaceCare's own figures from its 2026 Hard Floor Care brochure.

Battery Voltage Weight Charge Cycles Warranty
Wet lead acid 24 V 70 lbs 300 to 700 1 year max
NX300 lithium-ion 36 V 5 lbs 2,500+ 4 years
NX1K lithium iron phosphate 25.6 V 22 lbs 4,000+ 5 years

The NX1K and the NX300 are not interchangeable. The NX300 is a small 36 V pack for NaceCare's NX vacuums and compact scrubbers like the TGB 817NX, while the NX1K is a 25.6 V pack for the larger NX1K machines. Charge the NX1K only with the Numatic charger built into your machine. Numatic warns that a different charger can damage the battery or start a fire, and it voids the warranty.



Why You Should Consider a NaceCare Battery

The NX1K is built for Numatic's own machines, and NaceCare backs it with a 5-year warranty under its 2025 US warranty chart. To start a claim, NaceCare needs a clear photo of the battery's serial number, so snap one when it arrives. We're an authorized NaceCare retailer, and found a lower price? Call or message us and we'll beat it.


Specifications: NaceCare NX1K LFP Battery
Brand NaceCare
Manufacturer Numatic International
Part Number 911948 (LFP Battery Assembly NX1K)
Chemistry Lithium iron phosphate (LFP), sealed, maintenance free
Voltage 25.6 V
Capacity 50 Ah (1,280 Wh)
Weight 22 lbs (NaceCare); Numatic lists 10.7 kg (23.6 lbs)
Dimensions (L x W x H) 12.4 in x 5.2 in x 7.3 in (315 x 132 x 185 mm)
Charge Cycles 4,000+
Self Discharge Very low
Charging With the Numatic on-board charger in NX1K machines only
Charging Temperature 41 to 95 F (5 to 35 C)
Storage 59 to 77 F (15 to 25 C) ideal; fully charge every 6 months on the shelf
Compatible Machines TBL 1120/50, TBL 1120/100, TBL 1620/50T, TBL 1620/100T, TBL 2228/100T, TBL 2228/150T, CRL 2128/50T, CRL 2128/100T, TVL 850/150T to /300T
Not Compatible With NX300 machines (NX vacuums, 220NX, 440NX, TGB 516NX, TGB 817NX)
Warranty 5 years

Downloads

NaceCare Hard Floor Care Brochure, NX1K battery page (PDF, 1.7 MB)
NaceCare 2025 US Warranty Chart (PDF, 2.6 MB)


Frequently Asked Questions

Which machines does the NX1K battery fit?

NaceCare's NX1K floor scrubbers: the TBL 1120/50 (1 battery) and /100 (2), TBL 1620/50T and /100T (1 or 2), TBL 2228/100T and /150T (2 or 3), CRL 2128/50T and /100T (1 or 2) and the TVL 850 ride-ons (3 to 6). Send us your model or serial number and we'll confirm before you order.

Will it work in my NX300 machine?

No. The NX300 is a 36 V pack for NaceCare's NX vacuums and compact scrubbers such as the 220NX, 440NX, TGB 516NX and TGB 817NX. The NX1K is a 25.6 V battery for the larger NX1K scrubbers. They don't swap.

How do I charge it?

Inside the machine, with its built-in Numatic charger. NaceCare says you can charge it whenever it suits you, at any level. Numatic recommends a full charge after every use and an overnight charge at least once a month, and warns against any non-Numatic charger, which can damage the battery and voids the warranty.

How long will it last, and what's the warranty?

NaceCare rates the NX1K for more than 4,000 charge cycles, which it puts at about 15 years of cleaning five days a week. Its 2025 US warranty chart gives the NX1K a 5-year warranty. Keep a clear photo of the serial number, because NaceCare needs it to start a claim.

Can I add a battery to get more runtime?

NaceCare designed the NX1K so batteries can run in parallel, and that's how the two-battery TBL 1120/100 doubles the runtime of the /50. Each machine has a set number of battery slots, though, so tell us your model and serial number and we'll confirm with NaceCare what yours can take.

How should I store a spare?

Numatic recommends a dry, level spot at 59 to 77 F (15 to 25 C), a full charge at least every 6 months on the shelf, and putting a new battery into service within 12 months of its manufacture date. Switch it off with the top button (hold for 6 seconds) before handling it.

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