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Lawn Mower Starter Battery Part 2
Continued fromĀ

Hey, Charlie, sorry for the late response, but yeah, I get what you mean. It looks like these chargers have a similar algorithm to the TP4056 chargers. That the end current cutoff is around 1/10 of whatever the maximum is set to. Knowing this has made a difference in how I charge and balance my batteries.

Here's a little update on the mower battery.
[Image: 5b16f78228d47b526488a8c5ff483a24.jpg]

Sorry the image is a bit blurry, but you can see that after about 2 years of use, it's still got a fair amount of charge left. Although it is getting imbalanced despite my attempt to put similar capacity cells together. But it still works great, considering these are old laptop cells.

Just for fun, I did a little math, and found out that theoretically the battery could make 523 attempts to start the lawn mower between charges. Unfortunately, in real live, once the battery gets down to about 12V, it just can't produce the Amps needed for the starter.

On the other hand, just three 20A cells could replace this battery and make over 13,000 attempts between charges. For $12 I think maybe I'll try that and see what happens.

By the way, the SLA direct replacement battery for this mower is $70. A home-made LiIon battery would be cheaper, smaller, lighter, and way more fun.
-Mike G

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