Hobart Inventor Welding Helmet Battery and Lens Guide
The Hobart Inventor series sits at the professional end of the Hobart lineup. Its 9.3-square-inch wide-screen viewing area, four independent arc sensors, and analog controls have made it a go-to choice for production shops and serious hobbyists. When it is time to replace the battery or cover lenses, the part numbers are straightforward once you know them.
Battery: What the Inventor Uses
Every Hobart Inventor series helmet runs on a single CR2450 3V lithium coin cell. The official Miller/Hobart replacement part is 217043, a genuine CR2450 cell confirmed to fit the Inventor, Creator, XVX, PRO, Endeavor, and Impact auto-darkening lenses.
Hobart explicitly shares the same battery part number as Miller because both brands are part of ITW Welding. If you already buy Miller 217043 batteries for other helmets in your shop, those same cells work in every Hobart Inventor model.
The Inventor’s battery compartment is inside the helmet, integrated into the ADF housing. You do not need tools. Open the compartment, remove the old cell, note polarity, press in a fresh CR2450.
How long do they last? With regular shop use, expect six to twelve months. The auto-on/off feature helps by only powering the ADF when the arc triggers it, but some parasitic drain still occurs.
Inventor Series Models Covered
The 770858 lens kit and the 217043 battery cover these Inventor Series model numbers:
- 770890 - Black (the flagship)
- 770872 - CAT branded
- 770873 - Forerunner
- 770874 - Ember
- 770875 - Realtree Camo-Edge
- 770876 - Reactor
All share the same ADF cartridge, the same battery, and the same cover lens dimensions.
Cover Lens Kit: Part 770858
The cover lenses protect the ADF from spatter, scratches, and weld smoke residue. When the outer lens becomes obscured, arc sensor performance drops and weld visibility suffers. Replace it before it becomes a problem.
Part 770858 is the official clear protective lens kit for all Inventor Series helmets. It includes:
- 5 clear plastic outer (front) lens covers
- 2 clear plastic inner (back) lens covers
The outer lenses take the beating from direct spatter. The inner lenses protect the ADF face from fumes trapped inside the shell. Replace the outer lens whenever it becomes visibly scratched or tinted. Replace the inner lens at the same time if it shows haze.
ADF Replacement Lens: Part 770846
If the ADF itself fails or is damaged beyond the cover lens, the replacement auto-darkening cartridge for Inventor Series helmets is 770846. This is the complete ADF unit including the variable shade lens, electronics, and battery compartment.
The 770846 cartridge uses the same 217043 CR2450 battery, so you only need to stock one battery part number.
Magnifying Lens Compatibility
The Inventor helmets accept magnifying cheater lenses for welders who need reading correction. The 200x diopter magnifying lens 770276 is compatible with the Inventor and Reactor series. Check current Hobart accessories listings at hobartwelders.com for the full diopter range available.
Headgear
The Inventor series headgear provides extensive adjustability including ratchet sizing, top adjustment, and comfort cushion with sweatband. If you need a replacement headgear assembly, verify the part number directly with Hobart as headgear variants have changed across Inventor generations.
Quick Specs
| Specification | Detail |
|---|---|
| Viewing Field | 3.94 x 2.36 in (9.3 sq in) |
| Arc Sensors | 4 independent |
| Shade Range | Darkened #9-13, Light #3 |
| Switching Speed | 1/25,000 second |
| Operating Modes | Weld and Grind |
| Battery | CR2450 (part 217043) |
| Cover Lens Kit | 770858 |
| ADF Cartridge | 770846 |
| Weight | 19.7 oz |
Where to Buy
Miller part 217043 (CR2450) is widely stocked at welding distributors. It is available on Amazon with Prime shipping. The 770858 lens kit and 770846 ADF cartridge are available at hobartweldshop.com, bakersgas.com, and Northern Tool.
FAQ
What battery does the Hobart Inventor welding helmet use? One CR2450 3V lithium coin cell, Hobart/Miller part number 217043.
Is the 217043 the same battery for all Hobart helmets? For Inventor, Creator, XVX, PRO, Endeavor, and Impact series, yes. The Pillar uses a different arrangement. The Pro Hobby series uses a different battery. Always verify against your specific model.
How do I replace the cover lens on the Hobart Inventor? Open the lens retainer on the front of the helmet shell, slide out the old outer lens, slide in a new one from the 770858 kit, and close the retainer. No tools needed.
What is the part number for the Inventor ADF cartridge? 770846. This is the complete replacement auto-darkening lens for all Inventor Series helmets.
Can I use a generic CR2450 instead of the 217043? Generics work in most cases, but some have slightly different thickness tolerances that cause poor spring contact. Miller and Hobart recommend Panasonic or equivalent name-brand cells.
Does the Inventor series accept cheater lenses? Yes. The helmet is designed to accept magnifying lenses. Part 770276 (200x diopter) is confirmed compatible with the Inventor and Reactor models.
Does the 770858 lens kit fit the Creator Series too? Yes. The 770858 kit fits Inventor and Creator Series models that share the same ADF dimensions.
Part information sourced from Hobart Welders official product documentation and hobartweldshop.com.
