3 ms·
I've been looking to swap in a rechargeable battery for a 3-Button Mini Remote Control (LiftMaster 890MAX). The remote control's case 60 mm x 35 mm, the device
by thangalin 2y ago
I've been looking to swap in a rechargeable battery for a 3-Button Mini Remote Control (LiftMaster 890MAX). The remote control's case 60 mm x 35 mm, the device pulls 3V at 225mAh, and I'd like to replace the 3V CR2023 with an RJD2032C1 rechargeable coin cell battery from CDE.
The idea is to affix a thin, lightweight, high-efficiency 3V - 5V solar cell to the back of the case that can trickle-charge the battery, such as the SM141K06TFV from ANYSOLAR ($10.98, 184 mW, 58.6 mA, 4.15 V, 45 mm x 22 mm x 1.5 mm).
Ideally, the remote control would be battery-free, but not having to swap the battery more than once a decade would work. Any ideas on how to accomplish this?
- Neywiny 2y ago3v 225 mAh is not what it pulls. That's the battery rating. "Pulls" refers to the current at a voltage. For example, you may say that it pulls 100 uA at 3v. So, first step is to measure what it actually pulls. Ideally profile it over time and in different scenarios. Or record how long it takes to drain the battery, measure the battery voltage under a small but nonzero load, and approximate how much energy was drained vs time to get watts consumed. Then you can work out what kind of solar cell and charge controller you can pair it with. Unsure if MPPT would be needed here, you likely aren't going for the absolute max power efficiency.
- genewitch 2y agoA 555 timer makes a dandy solar charge controller...
- deleted 2y ago[deleted]
- ricardobeat 2y agoMy Samsung TV has this [1]. Maybe you can find a broken/used one to repurpose? [1] https://www.ebay.com/itm/405460571652 https://www.ebay.com/itm/405460571652