Hi, dexided to dust off and use my old yale MPB040EN24T2748, so I bought 4 US2200 batteries.
( there were 4 us1800 batteries on it )
Installed them and they work perfect, but now the 1-24020-04-hf charger does not light up, flash or come on at all.

The seller of the batteries told me not to get them below 50% without charging.
I'm going to send it out to get checked but in the mean time what's a good cheap charger to charge the 4 or do I charge em 1 by 1 with a regular charger?