Oh. And tell me more about this BT app!
Got your message and havenāt had a chance to respond yet. Be glad to go over it in more detail. The battery you have is an lfp battery. Those batteries are okay being charged to 100%. It has a cycle life of over 2,000 charges from 100% to 0%. Be glad to get you some more detail.
2000 charges will likely outlast this old guy but Iāll never say never 
.
Just a few other questions though.
What capacity is this battery?
If I get a battery with more capacity for my E4 when the lead batteries die off, will a bigger lithium use the same charger algorithm as this one (28)?
Is there an app for iPhone to download to monitor this battery?
On the monitor that came with this battery, when the little battery on the left indicates 99 or 100 ah, and the number on the right says 100%, would I assume that when the little battery says 90 ah at 100% that I might have lost some 10% of battery capacity? Something I may never see but info Iām just curious about.
Thatās about all for now. Iām happy that my wife is happy finally having confidence her little GEM will get her home from the golf course 
I would also like to purchase a lithium charger. How do we get in touch?
What battery and model car?
Wayyy more info needed to offer a proper solution.
As Inwo stated:
What battery and model car?
Where did you get your batteries? Does the manufacturer have a suggested charger?
What color is the car?