On Thursday, September 10, 2020 at 7:08:06 AM UTC-4, wrote:
, I use a charger that tells me how much charge (amp-hours) go into the battery, and it should correspond to how long I used it in the glider.

What charger do you use??

Thanks

Kevin
92

Imax B6. There are various versions, you can find one on ebay for $30 or so. It is a very versatile device, can handle batteries of various chemistries, test discharge capacity, etc. Thanks T8 for the tip.