# Kobalt 40V 8.0Ah Battery

> Kobalt 40V 8.0Ah Battery (KB 840-03) is a battery from Kobalt 40V. It is labelled 40 V, holds 8 Ah, weighs 3 lb, and has a 3-year limited warranty.

- Line: [Kobalt 40V](https://powertoolgrid.com/lines/kobalt-40v/)
- Category: [Batteries](https://powertoolgrid.com/compare/battery/)
- Status: current
- Data confidence: confirmed (last verified 2026-10-11; [what this means](https://powertoolgrid.com/how-we-compare/#confidence))
- Page: https://powertoolgrid.com/products/kobalt-40v-8-0ah-battery/

## Specifications

| Spec | Value | Source |
|---|---|---|
| Model number | KB 840-03 | [lowes.com](https://web.archive.org/web/20250520003332/https://www.lowes.com/pd/Kobalt-40-Volt-8-Ah-Lithium-Ion-li-ion-Battery/5015318915) (retailer, archive, 2025-05-20) |
| Voltage on the label | 40 V | [lowes.com](https://www.lowes.com/pd/Kobalt-40-Volt-8-Ah-Lithium-Ion-li-ion-Battery/5015318915) (retailer, archive, 2026-10-11) |
| Capacity | 8 Ah | [lowes.com](https://web.archive.org/web/20250520003332/https://www.lowes.com/pd/Kobalt-40-Volt-8-Ah-Lithium-Ion-li-ion-Battery/5015318915) (retailer, archive, 2025-05-20) |
| Energy | not published |  |
| Weight | 3 lb | [lowes.com](https://web.archive.org/web/20250520003332/https://www.lowes.com/pd/Kobalt-40-Volt-8-Ah-Lithium-Ion-li-ion-Battery/5015318915) (retailer, archive, 2025-05-20) |
| Warranty | 3 yr | [lowes.com](https://web.archive.org/web/20250520003332/https://www.lowes.com/pd/Kobalt-40-Volt-8-Ah-Lithium-Ion-li-ion-Battery/5015318915) (retailer, archive, 2025-05-20) |



## The same tool on other platforms

Same category, different line:

- [BLACK+DECKER 40V MAX 2.0Ah Battery](https://powertoolgrid.com/products/black-decker-40v-max-lbx2040/) — $89.00
- [BLACK+DECKER 40V MAX 2.5Ah Battery](https://powertoolgrid.com/products/black-decker-40v-max-lbx2540/) — $99.00
- [BLACK+DECKER 40V MAX 1.5Ah Battery](https://powertoolgrid.com/products/black-decker-40v-max-lbx1540/) — $79.00
- [Craftsman V60 2.5Ah Battery](https://powertoolgrid.com/products/craftsman-v60-cmcb6025/)
- [Craftsman V60 5.0Ah Battery](https://powertoolgrid.com/products/craftsman-v60-cmcb6050/)
- [Craftsman V60 7.5Ah Battery](https://powertoolgrid.com/products/craftsman-v60-cmcb6075/)
- [Craftsman V20 4.0Ah Battery](https://powertoolgrid.com/products/craftsman-v20-cmcb204/)
- [Craftsman V20 2.0Ah Battery](https://powertoolgrid.com/products/craftsman-v20-cmcb202/)


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PowerToolGrid lists battery yard tools from every brand side by side, with a source for every spec. [How we compare](https://powertoolgrid.com/how-we-compare/). Data as of 2026-10-29.