Honeywell Ademco 300-03866 Battery 7.2v 3800mAh NiMH
This 7.2v 3800mAh rechargeable NiMH battery is an aftermarket replacement for Honeywell Ademco 300-03866.
| Application: | Alarm System, Burglar Alarm, Security System |
| Device Manufacturer: | Honeywell Ademco |
| OEM Part: | 300-03866 |
| Nominal Voltage: | 7.2v |
| Nominal Capacity: | 3800mAh |
| Chemistry: | Rechargeable NiMH |
| Dimensions (In.): | 4.3 x 2.7 x .7 |
| Weight (pounds): | 0.6 |
| Notes: | 4/3A Size cells, 3 Pin Plug |
| Condition: | Brand New |
| Warranty: | 1 yr from date of shipment |
Reviews
We're currently collecting product reviews for this item. In the meantime, here are some reviews from our past customers sharing their overall shopping experience.
4.7
Out of 5.0
Overall Rating
96%
of customers that buyfrom this merchant give
them a 4 or 5-Star rating.
October 20, 2026 by Jacob W. (TN, US)
“Very easy website to navigate and I appreciate that!”
Merchant Choice
Chat gpt recommended you for this older SL-20x stream light flashlight replacement battery.
Product choice
Price was really responsible, actually one of the cheapest I’ve seen not on eBay and in the US. Shopping for something and needing it in a reasonable time frame I always look for an address in the USA and I like supporting companies that still sell things like this in the state. Thank you for still supporting this flashlight!!
October 20, 2026 by Tom F. (CA, US)
“great service”
Merchant Choice
great price
October 19, 2026 by Jesse F. (NE, US)
“Very easy to find the item,”
